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

Natural sonic phenomenon comes with a grisly legend of murder and blood.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A beautiful geyser under environmental threat.

A monument celebrating the idea of reaching inaccessible places.

Permanent exhibit reminds visitors of the Exxon Valdez.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

The most loyal of little dogs, or a Victorian era publicity stunt?

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

A 200-year-old collection of oddities and medical paraphernalia.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A unique geological area spiked with wind-carved rocks that resemble teepees.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

Large collection from the 3rd millennium BCE.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Where commuters walk through remnants of an ancient Greek necropolis.

This legendary city has been a tourist attraction for centuries.