This stately estate house features a tower covered in a bright, modern mural.

Countless grotesque faces stare out from this eerie Prague art wall.

This amazing 15th-century mural remained hidden in plain sight for centuries.

This abandoned church in central Lyon is missing its front stairs.

Possibly the smallest church in the world floats in the middle of a pond.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

In Faroese legend, this sinister horse-shaped beast lures unsuspecting passersby only to drown them in the lake.

This isolated structure beckons adventurers with sublime views of the Faroe Islands.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

A "simple-hearted artist" turned an isolated Icelandic valley into his own art museum.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

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

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

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

The United Arab Emirates's biggest and oldest fort pays homage to a lost era.

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

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

The unexpectedly beloved remnants of a controversial thermal power plant.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

One of Europe's largest supercomputers is housed inside of a disused chapel.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A lonely beacon, precariously perched atop a remote sliver of rock.