This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

The fantastic charm of England's oldest botanical garden has made it a place of writerly inspiration for centuries.

This saucy statue once caused outrage among locals.

This massive blockhead sculpture hides an entire library.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The unfinished final resting place of some of Spain's most prominent politicians.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

Remains of the lost church hide beneath this Spanish Parliament building.

A model solar system adds a celestial touch to this suburban park.

A lush indoor jungle fills this bustling Madrid transportation hub.

An ancient Egyptian temple in the middle of Madrid, Spain.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Unconventional site where the tracks of Zurich tramcars intersect.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

The most impressive of Basel's three remaining city gates.

This artistic fountain display pays homage to this area's theatrical history.

Pilgrimage site for star-crossed lovers.

The only museum with its curator—and her pets—buried inside.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.