The vast, legendary catacombs hold secrets much stranger than stacked bones.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

A Boeing mechanic and his wife leave a whimsical, stone sculptured garden as their legacy.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Week-long block party becomes a competition for the best decorated street.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The remains of a ruined mansion memorialize the 1906 earthquake.

Olfactory delights in San Francisco's Botanical Gardens.

A psychedelic labyrinth on the San Francisco bay.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Where America's first doomsday cult awaited the end of the world.

A layered tribute to the work of mosaicist Isaiah Zagar.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

Willy Wonka would love this weird half-a-home.

Secret Swing.

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Narrowest house in Boston.