The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

This icon of the Atomic Age now lays dormant.

Home to items never before seen by the public.

Eighteen miniature death-scene dioramas.

Where condemned pirates met their grisly end at the gallows on the River Thames.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Metal water storage tank turned ethereal concert hall.

A humble garage, world-famous for being the epicenter of a technology revolution.

The "Mona Lisa" of funerary art.

An unassuming secret door once led to a legendary watering hole.

A mysterious spirit totem at the edge of Navajo lands.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

This might just be the TARDIS of bookstores.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

A cheeky reminder about the value of art dangles above one of Olomouc's busiest streets.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

In a dry, neglected cemetery lies the unassuming grave of a soldier vilified in life but celebrated in death.

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

A fiery crater has been burning in the Karakum Desert since 1971.

The unbelievably opulent home built for an infamous newspaperman.

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