The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

A beautiful Arctic museum and nature center preserves the culture of the Sámi people.

The tiny, studious rodents greet visitors to the National Archives of Finland.

A little-known sculpture park of contemporary environmental art in a Lapland forest.

Hidden deep in a forest is this geological wonder carved by glaciers.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

The shell of a medieval fortress offers commanding views of the area it once protected.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.

The solemn exterior conceals an opulent interior of this 17th century church.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

Each year melting snow turns these Austrian hiking trails into scuba zones.

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

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.