This building holds the embalmed remains of the leader of the Bolshevik Revolution.

142 ceramic steps become a mosaic once a year.

This tremendous timepiece was once the largest cuckoo clock in the world.

The fairy tale castle of the "fairy-tale king."

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

These gardens recreate unique and endangered Michigan habitats.

3,000 market stands in five former Zeppelin hangars.

Famously misunderstood wonder of the ancient world

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A charming remnant of 19th-century fishing towns sits on Michigan’s Leelanau Peninsula.

An abstract monument to a symphonic composer.

A marvel of Byzantine engineering under the streets of Istanbul.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

A semi-scholarly approach to sex.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

Inside the Wayne County airport is an amazing collection of lights and sounds.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

This micro-nation may be some sort of prank, but its constitution sure seems official.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.