See massive fossils that are over 200 million years old in northeastern Arizona.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Where manatees are the snowbird vacationers in these balmy Florida springs.

A natural gas leak provides a flickering flame beneath a waterfall.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

The largest self-built castle in the U.S., six decades in the making.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Quite simply the largest tree in the world (by volume).

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore 10 acres of environmental sculptures.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A museum dedicated to the alleged Roswell Incident.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.