The Targaryens were on Dragonstone for about two centuries after the Doom before invading Westeros (I: 692. SSM: 1)
A thousand gargoyles sit on the walls of the ancient Valyrian fortress, each some twelve feet high. Among them are hellhounds and wyverns (II: 1)
The stones of the fortress are black (II: 1)
Behind the castle is the Dragonmont, an active volcano (II: 2)
Dragonstone was the westernmost outpost of the Freehold of Valyria (II: 3)
The towers of the citadel of Dragonstone are shaped by some art lost to the Seven Kingdoms, to seem like dragons so that they would appear more fearsome, just as the gargoyles around the walls replaced crenelations (II: 3)
One of the fortress towers is named the Sea Dragon Tower (II: 6)
The Chamber of the Painted Table is within the Stone Drum (II: 6)
The Stone Drum is the central keep of Dragonstone, named such because its walls boom and rumble during storms (II: 6-7)
Going down the stairs of the Sea Dragon Tower, one must then cross the gallery, pass through both the middle and inner walls with their gargoyles and black iron gates, and climb even more steps to reach the Chamber of the Painted Table (II: 7)
The gallery has a row of tall arched windows from which the outer bailey, the curtain wall, the fishing village beyond, and the practice yard can be seen (II: 7)
The Chamber of the Painted Table is a great round room with walls of black stone and four narrow windows that looked out to the four points of the compass. In the midst of chamber is a huge table of carved wood fashioned at the behest of Aegon Targaryen before the Conquest (II: 9)
The painted table is more than fifty feet long, perhaps half that wide at its widest, but less than four feet across at its narrowest. Aegon's carpenters had shaped it after the land of Westeros, its surface painted with the Seven Kingdoms as they then were; rivers, mountains, castles, cities, lakes, and forests were all marked (II: 9)
There is a single chair in the room, raised up and sitting precisely where Dragonstone would have been off the coast of Westeros (II: 9)
Dragonstone, though old and strong, commands the allegiance of only a few lesser lords whose islands are too thinly populated to provide any great numbers of troops (II: 11)
The doors to the Great Hall are set in the mouth of a stone dragon (II: 16)
Dragonstone's sept contains carved statues of the Seven. The Crone had pearl eyes, the Father a gilded beard, and the Stranger looks more animal than human. Many layers of paint and varnish has been applied to them over the centuries (II: 108, 109)
Aegon the Conqueror had knelt to pray in Dragonstone's sept the night before he sailed (II: 109)
The idols of the Seven on Dragonstone were carved from the masts of the ships that had carried the first Targaryens from Valyria (II: 109)
Over the centuries the statues had been painted, repainted, gilded, silvered, and/or jewelled (II: 109)
An old inn at the end of the stone pier of the port, a waist-high gargoyle so weathered as to be nearly obliterated standing outside (II: 112, 113)
The Gullet is a stretch of water beyond Blackwater Bay, between Massey's Hook and Driftmark (III: 109)
Driftmark has a long point, and by the time one passes it the island of Dragonstone has begun to come into view (III: 109)
The citadel of Dragonstone is wrought all of black stone (III: 110)
Being caught smuggling by the sea watch about Dragonstone was death in the days of Aerys (III: 110)
It is said that there are shafts and secret stairs leading from the citadel to the heart of the Dragonmont (III: 114)
The castle gates are made of iron-studded wood (III: 116)
From the citadel gates one can go through an arch named the Dragon's Tail and enter Aegon's Garden (III: 117)
Aegon's Garden has a pleasant pine scent, with tall dark trees on every side. Wild roses grow there, and towering thorny hedges, and there is a boggy spot where cranberries grow (III: 117)
Cells in the dungeons beneath the citadel are warmer than they ought to be, and as dank as one might expect for an isle such as Dragonstone (III: 285)
The passages beneath the mass of Dragonstone are smooth and stony and always warm. It's often said that they grow warmer the further down one goes (III: 285)
Old tales say that Dragonstone was built with the stones of hell (III: 285)
No windows pierce the thick stone walls of the dungeons (III: 286)
The houses sworn to Dragonstone are known as the lords of the narrow sea (III: 291)
At the third turn up the turnpike stairs from the deep dungeons one will encounter an iron gate, and another at the fifth turn nearer the surface as the dark, rough stone grows cooler to the touch. The door after that is wooden, but still the turnpike stairs climbs as it continues past the ground (III: 405)
A high stone bridge arches over emptiness to the massive central tower called the Stone Drum, connecting it to the dungeon tower (III: 405)
The bridge has a waist-high side (III: 406)
Four tall pointed windows look out to the north, south, east, and west in the Chamber of the Painted Table (III: 406)
Claw Isle is a few hours' sail from Dragonstone (III: 408)
Aegon commanded the Painted Table to be painted accurately to represent the Seven Kingdoms as they then were, but without any borders to signify that it should be one realm alone instead of many (III: 412)
Dragonstones grotesques and gargoyles are shaped in many fashions, each different from all the others. There are wyverns, griffins, demons, manticores, minotaurs, basilisks, hellhounds, cockatrices, and a thousand queerer creatures on the battlements (III: 602)
There are dragons everywhere at Dragonstone. The Great Hall is a dragon lying on its bellow, men entering it through its open mouth. The kitchens are a dragon curled in a ball, the smoke and steam of the ovens vented through its nostrils. The towers are dragons hunched above walls or poised for flight; the Windwyrm seems to scream defiance, while the Sea Dragon Tower gazes serenly out across the waves. Smaller dragons frame gates, and dragon claws emerge from walls to grasp at torches, great stone wings enfold the smithy and armory, and tails form arches, bridges, and exterior stairs (III: 602)
It is often said that the old wizards of Valyria did not cut and chisel stone, but worked it with fire and magic as one might work clay (III: 603)
From the cellar of the Sea Dragon Tower, one can exit through a door, walk across a courtyard and take steps down under the tail of a dragon, and arrive at a postern gate which is not far from the sea (III: 708, 709)
There is much obsidian to be found in the old tunnels beneath the mountain, in chunks, boulders, and ledges. The great part is black, but some is green, some red, and some even purple (III: 885)
Dragonlore was once accumulated on Dragonstone (SSM: 1)
Dragonstone is the least populous region in the Seven Kingdoms (SSM: 1)
The Valyrians settled Dragonstone not long before the Doom (SSM: 1)