A beautiful but toxic fountain of mercury.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Hundreds of hidden passageways weave through the old quarters of Lyon.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

A museum dedicated to the history and art of staying clean.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

One home in the historic strip hides secret compartments and the ghostly songs of long-gone canaries.

The old fire tower is one of the last of its kind in the United States.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

The largest outdoor art gallery in the Northwest United States.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

Jail from the 19th century that was built by inmates.

This museum glorifies the humble potato.

The blinking light atop the iconic landmark has been sending secret messages for decades.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A hidden subterranean installation offers a view of the sky.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Early prototype for Frank Lloyd Wright's Guggenheim.

A man-made island in scenic San Francisco Bay.