More than 21,000 images fill this overlooked gem of a prehistoric site.

Colorful Native American paintings are hidden within this small cavern.

Hidden in the Chihuahuan Desert resides an amazing collection of petroglyphs.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

Thousands of years ago, Indigenous people painted images onto these canyon walls that are still on display today, provocative, mysterious, and enduring reminders of the people who lived here long ago.

For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

A hidden world of exotic succulents and cacti.

800 apricot trees honor Silicon Valley's agricultural history.

One of the few places in the world where visitors can walk alongside fossilized tracks from 80 different dinosaur species.

This everlasting lightning storm may be the world's largest generator of ozone.

Mysterious rocks that ring musically when struck.

The oldest known metal-mining site in England dates back to the Bronze Age.

This ancient stone bridge dates back to the early Middle Ages.

Petroglyphs, bird watching, and a 100-year-old Ranch in one location.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

The first plantation museum in the United States to focus on the lives of enslaved people.

The blinking light atop the iconic landmark has been sending secret messages for decades.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

An exquisite tunnel of cascading flowers.

This Iron Age hill fort remained hidden until a series of storms revealed its history.