The charmingly disheveled clock tower of Tbilisi's puppet theater.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

A gigantic collection of teeny, tiny books.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Walk into the 19th century without leaving Brooklyn.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

This abandoned boat was left in place thanks to its rotting beauty.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Yo, Adrian!

Salute the leader of the proletariat.

Home of Philip Johnson, one of the 20th century's most influential architects.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

A posh members-only club with a literally dramatic history.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The palatial McDonald's that inspired Wesley Willis.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

A house of courtship where the Jazz Age's most storied lovers got their start.

100 massive sculptures in the Hudson River Valley.