This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

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

Theme park featuring miniature replicas of European monuments.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

A shrine-like museum entirely dedicated to soccer superstar Cristiano Ronaldo.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Baroque celebration of the end of the Great Plague of Vienna.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

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

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

Op-art architecture designed for happiness.

The topiary maze at the Habsburg hunting lodge.

The world's oldest known salt mine.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

An impressive monument to Poland's independence.

This Communist-era residential block is one of the longest residential building in Europe.

Old cabin-like homes in a rural community untouched by time are known for their vibrant and colorful window shutters.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

This antique thermometer honors the creator of the first universal temperature scale.

A statue honors the children who fought Nazis in Poland.