Places matthewboudier Wants to Go

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A library where thousands of books explain how to avoid another Great Recession.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

This king penguin is a knighted brigadier of the Norwegian Army.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

A trio of giant megalithic stones in the middle of a golf course.

Built to hold the worst of the worst of the Nazi war prisoners.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

This vintage gem is one of the oldest surviving purpose-built movie palaces in Scotland.

The heads of two giant mythological water horses honor Scotland's horselord past.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Descend into the tunnels to experience the life of a coal miner.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A once-magnificent collegiate church is falling into ruin.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

A floating cat sanctuary on an Amsterdam canal.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

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