A secret climbing tree hides along the side of a Costa Rican road.

Along a coast that sees the annual migration of humpback whales, a geological formation that takes the shape of a whale’s tail.

This wildlife refuge is home to more than 200 species of birds, as well as monkeys, lizards, and other wildlife.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

The translucent turquoise hue of these natural swimming pools comes from a high concentration of minerals.

This Costa Rican chapel is the most metal church in the world, literally.

One Costa Rican island is so beset by illegal shark poachers that the local rangers have built an entire bridge with their confiscated gear .

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

This Costa Rican topiary park is a surreal garden of unearthly delights.

Sloth rehabilitation center in the jungle of Costa Rica.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

These prehistoric replicas were based on actual skeletal remains.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The largest open-pit gold mine in Canada.

This artful dam holds back a crater-made reservoir that can be seen from space.

The only town in the world with two exclamation points in its name.

A tiny, picturesque island, where cows and wild horses wander around the houses.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

A 16th-century mosque rebuilt after wartime devastation.

The first mosque in the world to receive electricity.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

Two massive and unstable sinkholes are yearning to unite, and their consummation could be catastrophic.