This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

There has been an astronomical clock on this spot since the 14th century.

This shack nestled in a 120-acre forest of maple trees in Mont-Rigaud is a wonderland of sugary syrup.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This historic Canadian jail was once the longest operating prison in the country and is now open for people to incarcerate themselves.

Water of undetermined depth has attracted rare fish and cult leaders alike.

A picturesque garden with a surprising past.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

Geometry and mystery come together in an epic show of octagonal masonry.

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

An exquisite collection of fairytale conveyances that puts most car museums to shame.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The world's largest wooden structure.

Rare karst landscape eroded from a flat seabed.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.