Tubing through a cave lit with glowworms is a magical underground experience.

This sheep farm has been forever transformed since being built for “The Hobbit” film series.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The heads of two giant mythological water horses honor Scotland's horselord past.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Taxidermy of the racing horse with a huge heart, who inspired hope in the Depression.

Come for the flowers, stay for the bats!

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A clear example of the process of erosion in action.

Part bookstore, part café, and part forest.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

66,000 pieces of art, donated by one of the world's richest men.

This isolated Maya cemetery in Chiapas is distinguished by its towering, colorful wooden crosses.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Mexico's largest collection of masks is found in the ruins of an abandoned convent.

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.