Iron Age runes and ruins hide in plain sight along this Portuguese beach.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

The remains of what was, not so long ago, the world's largest city.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

In this century-old literary safehouse, print is alive and well.

Great Britain's only hat-making museum.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

An ancient city hidden in the heart of the Sierra Nevada mountains.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

The world's largest banyan tree is followed by a community of worshippers.

A mysterious, hidden cluster of Buddha sculptures carved into the rocks.

A fifth-century temple improbably built into the side of a cliff.

Hidden in the hills is a mysterious stone structure, known only to a few.

The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

A three-tiered waterfall plummets from a mountain cave with amazing views over the countryside.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Ruins and statues dot the landscape of this tiny island rich with royal history.

The largest and, arguably, most scenic fortress in Bhutan.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

Bridge that died in war and was resurected.

One of the world's largest model railroads is a mind-boggling achievement.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.