A silly medieval mural preserved on the side of a Viennese house.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

A spherical "micro-nation" in the heart of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The topiary maze at the Habsburg hunting lodge.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Fine dining in the bizarre world of Lewis Carroll.

A taste of the macabre Tokyo's ritzy shopping district.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This tree was extinct for a thousand years before sprouting again from a 2,000-year-old seed.

Where Venice's gondolas go for a tune-up.

One Confederate statue that accurately reflects the ugliness of its subject.

This luscious masterpiece created by landscape designer Bevis Bawa inspired the work of his brother, a famous Sri Lankan architect.

Reaching the "Church in the Sky" requires scaling the cliff face of a sandstone pinnacle with a 650-foot drop.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Structure built from the skulls of vanquished foes.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

The romantic botanic tunnel feels like a well-kept secret.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.