Most-visited and most-photographed slot canyon in the American Southwest.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A crumbling hospital from the 1850s on Roosevelt Island.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Rippling sand dunes frozen in the Arizona rock.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The weathered grave of a medieval anchoress who walled herself up in a cell attached to a church.

Oxford University's stateliest library seems designed to make students truly feel the weight of knowledge.

Banksy gives themself artistic license with this piece of London street art.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

This church carved into the rocks is full of enchanting stone statues.

During World War II, this rice mill became a Nazi concentration camp.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

A gorgeous medieval library where the books are kept in chains.