A marvel of Byzantine engineering under the streets of Istanbul.

The longest cutting on the M62 contains some surprises—though it's best to leave the motorway to appreciate them.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

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

Home to the most complete dodo remains known - one head, and one foot.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

It's believed that the dead were once taken out of houses through these now walled-up doors.

The first skyscraper to include a Ferris wheel built into the facade.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

This Late Gothic building that once housed Erasmus is now known as the filming location of "Suspiria."

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

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

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

Winner of the Leeds Award for Architecture and the Environment.

The house in the middle of the motorway.

These strikingly barren, rolling red hills were caused by bad farming practices.

Home of one of history's most famous cartoonists just as he left it.

The oldest candy store in the world has been selling traditional sweets since 1827.

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

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

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

Semi-precious Blue John stones have been mined in this cavern system for centuries.

A glacier pocked with ice caves and surrounded by rainforests.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.