The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Children's author May Gibbs's beloved stories about the tiny, human-like "Gumnut Babies" are immortalized in bronze.

A Swiss man built this airstrip for aliens because a UFO captain telepathically told him to.

This nugget of paradise earned its name for obvious reasons.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

The first piece of public art dedicated to LGBT rights.

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

A giant roll of mints marks the birthplace of one of America's most famous candy brands.

The only rotating bar in New Orleans has been slowly spinning since 1949.

A giant roadside black bird marks the location of this eclectic local mall.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

Stockholm's deepest subway station is also a stunning ecological wonder.

A mesmerizing sculpture marks the site where the activist was arrested after evading capture for 17 months.

The world's largest bust sculpture celebrates the Hindu deity, Shiva.

This abandoned Brutalist treehouse is a hidden architectural relic.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.

A homemade anatomical collection of medical anomalies and accidental catastrophes.

Eritrea's futuristic gas station is a nod to Italy's fascist history.

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

About as hidden as can be, this specialty coffee shop is wedged between multi-story buildings at the end of a dark, skinny alleyway in Seoul.

History, geography, and shamanism meet in this eye-catching monument to the greatness of three empires.

This magnificent abandoned hotel has long been haunted by its Nazi past.