A wall of chewing gum moonlights as collective art.

This working class sculpture pounds his hammer all the livelong day.

This Puget Sound military post has a long, turbulent history as a gateway to the Pacific.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

An eclectic restaurant serving from and to the nearby Chittenden Locks.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

This historic Victorian hotel has a scandalous history of affairs and murder.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

This demon atop the Notre-Dame de Paris looks utterly bored.

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

France's most famous cemetery, with some of its most curious tombs.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Elevated freight railway turned wildly successful urban park.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A Roman spa buried deep beneath the City of London.

Giant, friendly pelicans in Central London, the most unlikely of places.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

Petrified footprints of one of the very first vertebrates to walk on land.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

This single room has survived the centuries with almost no deterioration.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.