Each time a baby is born in Ghent, these streetlights flash in silent celebration.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

A mechanized clock where a man fights off a dragon, crab, and rooster.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A virtually untouched "home on the hill" for the flora and fauna of Rhode Island.

Huge winged monument in the United Kingdom.

The atmospheric road was never meant to be so creepy.

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

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The community pools that the community refused to give up on.

These fantastically named natural pools look like something out of a Scottish myth.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

This Scottish bridge seems to compel dogs to leap to their death.

360° views of the city plus five floors of optical illusions and hands-on science.

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