Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

On a small Slovenian island, diners can mix and match a classic cake into dozens of sweet and savory flavor combinations.

This former railway facility is the oldest in Slovenia, and now houses a museum showcasing the history of steam locomotives.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

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

A bizarre form of natural mummification was discovered in the church of this Frisian village.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

Remarkably preserved body discovered in a peat bog.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Charles Babbage's proto-computer, painstakingly brought to life.

The monster at the center of the Darwin Center Spirit Collection.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

A clock designed to run with perfect accuracy for 10,000 years.

The television series' iconic giant foot was borrowed from this classical painting.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A tongue-in-cheek arcade where the games are based on everyday life.

A hands-off space for graffiti artists to hone and display their skills.

A kaleidoscopic warehouse-maze of handmade neon signs.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.