I'm still in the Caribbean, but thought I'd share more of the photos I took on my day playing tourist in Istanbul.
The Hagia Sofia was dedicated in 360 AD (the current structure was built in the 500s AD) and has been a basilica, a mosque and is now a museum. It is famous for its massive dome and, at least according to wikipedia, it changed the history of architecture. I'm not a history buff, or an even an architecture guru, but I do know it was an amazing place. Just knowing that it's been there for nearly 2000 years was enough to blow me away.