This miniature feudal castle was built on a whim to honor a US Navy pioneer.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

Nature's biggest mammal swims in landlocked Oklahoma.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This remarkable collection devoted to the study of fish includes 1 million preserved specimens from all around the world.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

Gold Rush-era tombstones line the park's paths.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

This innocent-looking townhome is actually a subway exit.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Native Americans built this circle of stones, which was used to predict astronomical events.

The greatest collection of New Orleans masking and processional traditions covering everything from Baby Dolls to Skull and Bone gangs.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Cemetery featuring rare glass-fronted columbarium.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.

The world's largest man-made underground caverns offer unparalleled underwater wonders.