This disused Cold War bunker has been restored to all of its early 60s glory.

No matter what it might seem like on film, most scenes filmed on a plane are filmed at this LA studio.

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

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

A unique museum tells the story of the day-to-day life of World War I soldiers.

This historic little railroad runs through some of the most beautiful scenery in Germany.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.

A dormant lightning machine equal to all the power in Russia.

This restaurant was removed from the famed sister ship of the Titanic and placed within a hotel.

World's largest cave was only discovered in 1991, and now offers tours to the public.

A network of concealed passageways lies within a busy London Underground station.

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

One man's ambition created this psychedelic log home.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

An Aztec snake god has taken the material form of an apartment complex.

A true treehouse near Hawai'i Volcanoes National Park.

An abandoned relic of the city's failed experiment with below ground transit.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

A clumsy-looking flying locomotive rusts within sight of a busy rail station.