Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This massive redwood tree has a hole in the base big enough to drive through.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Giant topiary dog once played a role in a terrorist bomb plot.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Abandoned 18th century weapons factory in the Aezkoa Valley.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

The largest underground church in Europe.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

Famously misunderstood wonder of the ancient world

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Historic medieval fortified city in southwest France.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

A Gothic cathedral created from volcanic rocks.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Fortified medieval tower house with lovely roof garden.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Geothermal waterfalls in Tuscany.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.