The tragic heiress Barbara Woolworth Hutton built her seventh husband this Japanese-inspired palace in Mexico.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

This deceiving white sand beach gets its brilliant hue from the chemical discharge of a nearby factory.

Once an ancient Roman bath, now a hotbed of geothermal energy and a hub for energetic innovations.

Take a giant yellow bird cage to the top of Elba's highest mountain.

All that is left of this medieval castle is two towers, both of which now display a visible tilt.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The origins of a large, medieval castle are shrouded in mystery, but now it's a delightful garden.

A medieval castle was used for centuries as a hemp farm.

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

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

This precariously perched fortress was once ruled by a crow-worshipping baron.

Boats must transform into railroad cars to navigate this Polish canal.

This 13th century Gothic brick castle is the largest in the world by surface area.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

A collection of collections, including an anatomy museum, the “Cabinet of Physics of Alessandro Volta, a museum of natural history, mineral collection, and much much more...

The Pope’s secret escape route.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

Climb inside an iron crystal magnified 165 billion times its normal size.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A small alleyway lined with locally drawn scenes of nostalgic anime and cartoon characters.

This museum is housed in an unassuming building that witnessed one of the most daring feats of satire in modern history.