Countless stories attempt to explain Poland's mysterious J-shaped trees.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

This small museum displays a collection of outsider art and scale models of past "treatments" for mental illness.

Artworks by loners, prisoners and the criminally insane.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

World's largest permanent maze made of 18,000 conifers.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

The steepest classic funicular in the world glides along a dizzying incline.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

A historic and beautiful Art Nouveau chamber in a historic railway station.

This village in Bohemian Switzerland hosts more than 300 wood carvings inspired by fairytales, folklore, and other oddities, as well as a series of Communist-era tanks

Stroll past dozens of intricately-detailed scale replicas of buildings from all over Czechia.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

Heralded as one of the prettiest castles in all of Czechia.

This ruined castle perched atop a rocky peak is a great place for a hike.

Unique house covered in a nightmarish mural of demons, ghosts and monsters.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.