The enormous appendage offers spectacular views of Colombia's Huila Department.

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

An artificial crater field that trained astronauts for lunar exploration.

This amazing collection includes rare stamps from around the world, including fluorescent ones.

Only a fragment of this 15th-century Dance of Death survives today.

Few people have ever heard of, let alone visited, one of Turkmenistan’s most impressive natural attractions.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

A 200-year-old prison that now houses a peculiar crime museum.

The sign at the garden gate reads: "These Plants Can Kill."

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

A wonderful collection of fossilized dinosaurs and other creatures that roamed the landscape millions of years ago.

See hundreds of herons and egrets in the heart of the city in this dreamy hidden park.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.

Made from local Irish moss, this pie is served only in Prince Edward Island's potato museum.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

Get up close and personal with these majestic fish.

Pyongyang’s Arch of Triumph is the second tallest triumphal arch in the world.

A surprisingly beautiful abandoned World War II military base in East Greenland.

The beloved war-time celebrity spent time in the area before retiring to the Edinburgh Zoo.