A hollowed-out baobab that became the horrific final resting place of leprosy sufferers, with gruesome evidence to prove it.

This amateur-built East African church with mismatched towers is an architectural abnormality.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A marvel of Byzantine engineering under the streets of Istanbul.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

These Stalin-era industrial 'death traps' hang lifeless above the city

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

You'll find just about anything in this funky Tbilisi flea market.

With over 10,000 lights, this engineering marvel lights up the city after dark.

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

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.