Malaysia's floating mosque.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A hollow cement depiction of time's inexorable effect on the human body.

An enormous park-like oasis, full of famous Chicagoans' graves.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

Quite simply the largest tree in the world (by volume).

A 19th-century cabin built into a hollowed-out Sequoia tree.

Four hundred granite steps were built into this massive rock by the National Park Service.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

"Only the devil could play golf here."

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

Hindu temple of the dead home to hundreds of long-tailed macaques.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

This unique zoo is the only place in the world where you can see all 15 species of crane.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

A unique botanical garden housed in three giant geodesic domes.