The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

A chapel on a volcanic core, marking the end of a successful journey.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

A no-frills cinephile haven known for showing offbeat, underseen films.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

The world's largest reflecting pool is just two centimeters deep.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

An icy lake tucked among jaw-dropping alpine panoramas.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

A French library that makes sure its love of books is writ large... giant in fact.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

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

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.