The world's largest rotating world.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

One man's swirling six-acre monument of stone.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

An abandoned town is hidden in Great Smoky Mountains National Park.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

A Nessie-like monster supposedly lurks in this lake.

A saloon and inn that served the Wild West's most iconic figures—and is still haunted by some of them today.

One incredible room in the Santa Barbara Courthouse is covered in wall-to-wall canvas murals.

This is the oldest Roman-made bridge in the city still existing in its original state.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

This granite rock face is named for the magnificent reflection that occurs when the sun hits it just right.

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

Deep in the Negev Desert, the world's tallest solar tower looks like a sight straight out of science fiction.

The only quarter of the Old City not dedicated to a major world religion.

The tallest waterfall in the Judean Desert is named for its connection to a biblical figure.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

Millions of numbers carved in glass represent the tattoos forced upon victims.