A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

A collection of art from Bulgaria's time as a communist state.

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

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

Version of the French Riviera destroyed by the sea.

An off-grid art installation that encourages its visitors to imagine a world without waste.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

America's most famous piece of self-built architecture.

Instead of faces, these sculptures have barcodes—statements on societal dehumanization.

An urban laboratory.

A tiny slice shop hides down an unmarked hallway in a Las Vegas casino.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

An exotic wildlife habitat right off The Strip.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

Over 120,000 curious objects that have shaped our modern world.

A community of collapsing homes more than a mile out from the Florida coast.

The oldest civic library in Italy can trace its foundation back to 1619.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

One Italian taxi driver covered his entire house in small seashells creating a weird bit of architecture that is preserved to this day.

Where members of the Crossbow Corps of San Marino demonstrate their skills.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.