Volcanic rocks ground down into sand make this Spanish beach as black as night.

A pocket of serenity in hectic Buenos Aires, complete with a peaceful courtyard and massive library.

A preserved stretch of ancient fossilized trees with an impressive gem collection to boot.

A gorgeous stone viaduct crosses over a bucolic valley.

An ancient pagan site swirling with legends in the foothills of Franconian Switzerland.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

The conquistador's former fortress is the oldest preserved colonial building in the Americas.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

This striking sculpture of Icarus honors Greece's fallen flyers.

This eye-catching roundabout sculpture commemorates one of England's best World War II-era "shadow factories."

Walk through row upon row of manicured miniature trees at the United States' largest bonsai nursery.

This once-private estate is now a dreamy, meditative garden that's open to the public.

Lumps of significant stone from around the world surround a flaming monument for peace.

A spoke-tacular artwork constructed from recycled bicycle rims.

The extensive relics of an ancient Roman and Phoenician fish processing plant hide in a town park.

This peaceful park with centuries of history hides in an overlooked section of South London.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

This remote stretch of sand is a penguin lover's paradise.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

Part of an abandoned19th-century fortress hides in plain sight inside a modern office building.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

These bronze sculptures sow whimsy by hamming it up on a pedestrian mall.

Modern megaliths form this work of cosmic, Celtic landscape art.