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

The library's graceful rotunda is like a bibliophile's temple.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Watch butterflies take flight before you fly.

The history of those incarcerated in Singapore during World War II is etched into the bricks of a popular staircase.

This fountain was once heralded as the largest in the world.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Frozen in Norway, vended in Singapore.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

Several land speed world records were shattered at this Welsh beach.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

A Welsh sheep farm provides daily (non-sheep) meals to red kites, producing dazzling displays of aerial acrobatics.

The world's smallest movie theater runs on solar power—an attraction in itself.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

The longest and tallest aqueduct in Britain can actually be sailed across.

After years of slow decline, a derelict Gothic castle is now being restored to life.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A licentious look into Singapore's past, full of disorderly bric-a-brac and disreputable characters.

"Would you like your sangria in an IV bag, or straight-up?"

Colorful umbrella-covered trees in Singapore's Little India look straight out of Dr. Seuss.