The largest art park on the European continent.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

MIT students continue the legacy of beloved professor "Doc" Edgerton through learning by doing.

One of Mother Nature’s geological gems, home to many prehistoric fossils.

An abandoned amusement park hints at the twisted history of the Newfoundland Railway.

The closest thing to Mars on Earth.

This Hindu temple is an architectural marvel designed and built according to ancient Indian principles.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

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.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

Known as one of the most climbed mountains in the world, this barren peak is permanently bald thanks to an anti-wolf fire.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Even Henry David Thoreau found this glacial pothole irresistible.