A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

Dark, eerie exhibits make for a surreal exploration of the subconscious.

A memorial to the victims of Argentina's "Dirty War."

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

The world's largest indoor go-kart racetrack is hiding in Connecticut.

The Bourbon royal family had this unique octagonal hunting "cottage" built on a tiny islet in Lake Fusaro.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

An overgrown garden stands as a grim marker of an unrealized dream.

The winter home of millions of migrating monarch butterflies.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

This unique sanctuary invites you to interact with the beautiful birds.

A prized globe signed by Amelia Earhart and Charles Lindbergh sits in the Brooklyn office of the American Geographical Society.

The largest and, arguably, most scenic fortress in Bhutan.

Panorama exhibition hall in old silent theater with a beautiful backyard garden.

This museum offers an actual time machine back through Colorado's past.

The bartenders at this crime-fighting theme cafe are actual private detectives by day.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.

A bike train runs along a disused railway line through the tranquil French countryside.

This vintage animatronics show is the Vegas version of a walk through the woods.

This elaborate estate contains a stunning marble aviary, a sunken conservatory, and a magnificent music room with a two-story pipe organ.

From 135 feet high riders plunge down the world's tallest freestanding body slide at 65 mph.

A German town is growing a building out of trees.