Steep canyon walls hide a forested oasis in the West Texas desert.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

The Grand Canyon of Texas.

Free public park and gardens filled with peacocks and peahens.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

A grove of colossal man-made flowers built to collect the sun's rays.

A popular swimming hole that hides one of America's most deadly diving spots.

An emerald-green grotto just a short trip from Austin.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A naturally beautiful, seemingly bottomless deep blue spring.

A mountain of conch shells created by centuries of fishermen.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

Watch the seas clash at the place where according to Maori tradition, the spirits depart for their journey to the afterlife.

Natural rock water slides hidden in the remote forests of northern Idaho.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

This secluded walking trail is a hidden gem of a Pittsburgh park.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.