This legendary urban waterfall creates a dazzling display of rainbows.

These ancient sacred grounds granted amnesty to those who managed to reach them.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

This black shoreline is made up of exploded lava particles.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

A diorama of the Civil War, fought by cats.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

An Irish Memorial commemorating those who perished due to potato blight.

One of the oldest of its kind.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A monument marks the location of the first successful steamboat demonstration.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Time travel with sweets across history at this research-based candy store.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

America's post-nuclear-attack chambers of Congress.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.