An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This collection of 20th-century toys is filled with a lifelong personal toy collection brought from the U.S. to Amsterdam.

A unique collection of gilded age mechanical pianos.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The world's only museum devoted to the wonders of fluorescence.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

A micronation on an islet along the coast of a Portuguese island.

Huge winged monument in the United Kingdom.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

Drink among marionettes at this pub inside a historic puppet theater.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

Eastern Bloc nostalgia, anybody?

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

A golden egg-shaped sauna in the Arctic tundra.

The world's first ice hotel is still one of the most elaborate and beautiful.

The world’s largest knitted mitten is displayed in one of Sweden’s smallest Arctic villages.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

Explore the frozen river and take a walk to a nearby island on some of the longest ice roads in Sweden.