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

New fungal and bacterial species call this deadly lake home.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Home to three historic ships from the age of Vikings.

The fossilized remains of ancient California redwoods.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The second oldest continuously operating bar in Louisiana.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

One of the ghostly stops along Route 66.

The most visited, and possibly most controversial, museum in Germany.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

One part local history, 99 parts gruesome haunted house.

A beautiful geyser under environmental threat.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Elevated freight railway turned wildly successful urban park.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

The site of the climactic scene from the classic horror film is now a historic landmark.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Museum preserving torture methods from the past.

The ghost town that ended up on Ebay.