Spend the night in this formerly abandoned traditional Scottish village.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

The longest hedge maze in the world.

See massive fossils that are over 200 million years old in northeastern Arizona.

This semi-secret storybook hedge maze is also the oldest garden in the city.

A whimsical village of unique treehouses resides in a Washington forest.

Rebuilt remains of a temple to Roman god Mithras.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

San Francisco's newly reopened hands-on science museum.

Northern Ireland's Brobdingnagian stepping stones.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Rising from the sea like a stone monster.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The world's longest known cave system.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Towering basalt columns, a creation of fire and ice.

A beautiful geyser under environmental threat.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.