A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

An abandoned stretch of highway, deteriorating next to the operational one.

This black church sits alone among a field of lava rock.

The most powerful waterfall in all of Europe.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This beautiful, historic church looks like something out of a simpler past.

Once the most densely populated place in the world, this island is now a ghost town.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Hot springs monkey spa in the middle of Hell's Valley.

A toxic ghost town sitting atop a massive coal fire.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Pennsylvanian mass grave and possibly mass murder.

Where America's first doomsday cult awaited the end of the world.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A rare view of a preserved Victorian science museum.

World's first "penitentiary," meant to be humane, drove men insane.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

This abandoned subway station can still be seen on regular commuter trips.

New York City's smallest piece of private property.