A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Geodesic dome luxury retreat in the Scottish Highlands.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

It's not a typo, now say it five times fast!

This modern monument to pagan belief looks like it was transported straight from ancient times.

A strange rock in Chicago marks the spot where a tree once stood in honor of the 18th President.

A hollow cement depiction of time's inexorable effect on the human body.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

Rivers of cattle blood gone, a strange Escheresque building remains, the last of its kind.

This psychedelic tourist trap is a leisurely descent into madness.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

A performance hall at the American Jewish University moonlights as a sci-fi film location set.

The legendary building that needed ghostly approval before being built.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

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

Historic funicular railway, believed to be the shortest railroad in the world.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

A tunnel dug through the side of a mountain by hand provides convenient yet death-defying access to a small village in China.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Looking for a crappy restaurant? Pull up a porcelain bowl and enjoy your meal.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

A world-class observatory in the California desert.