A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Abandoned Nazi train station turned underground astroparticle laboratory.

An architect transformed this abandoned cement factory into his castle-like workshop.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

Stumbling upon this whimsical wooded garden is like stepping into an enchanted forest full of philosophical musings.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

The top of society once luxuriated in this world-class hotel, which continues to impress, even in ruin.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A majestic hotel for dreamers rises from the center of a fairytale wood.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

A modern sliver of architecture in Roma.

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

This miniature take on the Kremlin is one Dutch man's retirement project.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

A domed disco abandoned since the '70s now attracts artists and explorers under its unique roof.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.