This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

The first skyscraper to include a Ferris wheel built into the facade.

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

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

Ancient rock-hewn town that witnessed key events of Georgian history.

Underground monastery and fortress.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

What happens when you cross a mayor and a painter?

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

The most confusing clock in New York.

There must be a pun in this haystack somewhere...

The site of the deadly Triangle Shirtwaist Factory Fire.

An annual extravaganza of Broadway theater memorabilia.

Hear the tales of New York's most notorious criminals.

Unrepaired walls from a 1920 anarchist bomb attack.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Visit the monolithic tomb of America's most famous general.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.