An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

In an isolated field near a dilapidated barn stands this chilling portrayal of the plight of the Nuba peoples of Sudan.

Colorado's only true geyser is hidden within the San Juan National Forest.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

The colonial city's social history is reflected in its fanciful door knockers.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

When the public was consulted about a new piece of street art, they naturally asked for an enormous metal dragon.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

The Andean town where every single building is decorated with a brightly colored frieze.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

The whimsical steel spider lurking in the shadows of this suspension bridge shows that engineers can have a sense of humor.

A scenic ravine with an astounding collection of rock art created by the Indigenous people of the Great Plains.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

A tiny traditional village keeps an ancient method of beekeeping alive.

Because sometimes the most efficient route from A to B isn't a straight line.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.