The first park built over a freeway is a brutalist masterwork.

A giant Troll lurks under one of Seattle's oldest bridges.

A wall of chewing gum moonlights as collective art.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A monument marks the beginning of the longest north-south road in the United States.

This national park dedicated to the tallgrass prairie ecosystem still displays its military past.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A yoga studio and venue for "chill-out parties" in a former chicken slaughterhouse.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Climb inside an iron crystal magnified 165 billion times its normal size.

The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

A little sculpture with a large wardrobe.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

Two thirds of this Montreal neon icon has survived to flash another day.

A historic Montreal market that was the city's agricultural hub for over century.

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

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