The small cave that housed Tennessee's "first citizen."

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

Rare recess caves fill this unbelievably beautiful Ohio park.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Four metal statues of massive animal penises stand outside the university's Animal Sciences building.

The oldest place in Hartford is a cemetery with thousands of bodies stacked beneath the grass.

The graves of a Connecticut family thought to have been plagued by a vampire.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

The most southerly spot on New Zealand's South Island is home to surreally shaped, permanently mangled trees.

The premier place to experience the Victorian imagining of the steam-powered future.

These phallic stone spires once served as Tolkien's Paths of the Dead.

Highly spherical boulders on the shores of New Zealand.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

Some of the clearest water anywhere in the world.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

Hundreds of skulls and bones at the largest skeleton museum in the country.

Just below the surface, shrimp are producing temperatures hotter than the sun.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

Arrr! The most authentic collection of pirate artifacts in the world... matey.