The fifth-longest natural arch in the world, and the longest outside China.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

The only completed wing of Utah's first capitol is filled with artifacts and odd stories about its past.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

The iconic remains of the original Academic Hall that burned down in 1892.

The world-record holder for the longest bridge stretching continuously over water.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

This spooky statue sits outside a famous Prague theater.

A charming beach town in Turkey captures all the colors of the rainbow.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

Hidden within a spa in a Texas strip mall is a restaurant specializing in Eastern European foods.

An unexpected desert oasis in South America.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

A Christian monastery stands on what was once a holy Incan temple.