One of Europe's oldest libraries.

The whimsical twist of this spire was either caused by the Devil, an unexpected virgin, or lead.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This modest marker near Notre Dame identifies the very center of Paris.

The celebrated eyesore created by starry-eyed sweethearts.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

This hot dog-shaped diner has moved all around Colorado, but has never been to New York.

Oddly shaped rock formation, misassociated with a nearby utopian community.

One part local history, 99 parts gruesome haunted house.

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The most loyal of little dogs, or a Victorian era publicity stunt?

Famously misunderstood wonder of the ancient world

A open air theatre built on a cliff by an eccentric British woman.

Giant naked man on a hillside.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Used as an example in one of the first dictionary entries for "museum" in 1706.

Isaac Newton's former home, where the famous apple tree still stands.

A miniature village mimics the surrounding buildings so well it includes itself.

An open air haven for tropical monkeys in the damp moors of the English country.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.