Largest cave system in Africa.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

A beautiful 62-acre Catholic shrine and botanical garden.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

The fifth-longest natural arch in the world, and the longest outside China.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Follow the steps, and this roadside artwork will teach you how to dance.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This historic train station has been converted to a locomotive themed hotel.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

One of the oldest living oak trees in the Southeast.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

Formerly the most gerrymandered district in the U.S., it twisted and turned along racial borders.

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

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A psychological self-portrait in the form of a giant, segmented head.