Braavos looked awesome!
Some good background info on Braavos if you don't already know or just want a good read:
*** "Braavos is the strangest, a city erected not by the Freehold, but against it. A labyrinth of illusion and deceit to hide the refugees from Valyria's slave-lords. After the Doom, the city emerged from the shadows to become of the greatest banking centers in the world."* ―Ser Jorah Mormont discusses the Free Cities.
"Braavos is one of the Free Cities. It lies east of Westeros, across the Narrow Sea. It is the northern-most, the richest, and arguably the most powerful of the Free Cities. The city spans hundreds of tiny islands connected by small stone bridges. As well as the city itself, the rulers of Braavos also control the surrounding lagoon and a strip of the coastline southwards towards Pentos.[1][2]
A giant statue of the Titan of Braavos guards the harbor entrance to the city. The people of Braavos are known as Braavosi. Braavosi are revered seafarers and swordsmen.[2]
Unlike Westerosi nobility, wealthy and powerful Braavosi favor wearing dark colors."
Some more Braavos history:
Braavos lies at the northwestern-most end of the Essos continent, roughly due east of the Vale of Arryn. It is the only one of the Nine Free Cities which was not a former colony of the Valyrian Freehold. The city was founded by galley slaves after they staged a mutiny and killed their Valyrian overseers. Directed by the Moonsingers, they sailed as far north as they could in the Narrow Sea in search of a refuge. They established the Secret City of Braavos and kept its location secret for over four centuries, accepting other refugees and escaped slaves in the process. Because of the nature of its founding, Braavos does not keep slaves, does not like to do business with those who keep slaves, and frequently uses its military and economic power to encourage other states to give up slavery. After the Doom of Valyria four hundred years ago Braavos revealed itself to the world, and as the other Free Cities were left in chaos for decades after the Doom, Braavos rose to become the most powerful of the Free Cities. Due to its unique origin, Braavos is sometimes referred to as the Bastard Son of Valyria.
Couple of Characters from Braavos:
Syrio Forel, First Sword of Braavos.
Jaqen H'ghar, one of the Faceless Men of Braavos, a feared order of mysterious assassins with the ability to change their appearance at will.