"Unity, Creativity, Beauty."

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

A German apartment building hosting as many trees as human occupants.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

These 18th century gardens tell a rocky story of the son of Odysseus.

No need to strap in for a "ride" on this walkable roller coaster.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A stairway to heaven, or to nowhere at all.

When the rain falls, this drain system turns into a musical instrument.

Art and a pun, all in one.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The house that took a plunge into the facade of a museum.

The world's most important buildings shrunk to a tiny size.

Part ski resort, part modern art space, this lodge brings giant metal spiders and bloody doors to the Austrian Alps.

Apartment complexes built into huge repurposed natural gas tanks.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Be(w)ar(e) the moat around this historic Czech castle.