A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

A place to see how French aristocrats lived in the early 1900s.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Mexico's National Sound Library houses music, recordings, and voices from the nation's rich past.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The narrowest street in Paris.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

An icy lake tucked among jaw-dropping alpine panoramas.

1898 German railroad depot museum with working engines, steam train excursions, and hands-on displays.

Crop circles inspired this whimsical garden in Germany.

A German apartment building hosting as many trees as human occupants.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.