This South London cemetery holds the remains of more than 15,000 people.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A historic house left in "dramatic still life."

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An abandoned Cold War missile radar site.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Dine amidst exotic plants at this former royal greenhouse.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

This cubist Vienna church building looks like some sort of alien stonehenge.

A spherical "micro-nation" in the heart of Vienna.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

The beautiful baroque library of the Hapsburg empire.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A prime example of New Orleans' unique architecture these early 20th century homes were built to look like steamboats.

One of Chicago's last seafood smokehouses perfects a dying breed of fishcraft.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

Looming communist pillar with a Czech twist.