Where sweethearts leave their love locks in the Uruguayan capital.

This beautiful example of neoclassical architecture is one of Uruguay's most treasured cultural gems.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This artificial archipelago was supposed to resemble a map of the world.

A strangely forgotten claimant to the much contested title of "Source of the Nile."

The home of half the world's population of critically endangered mountain gorillas.

This small roadside eatery exists in both the Northern and Southern hemispheres, as the equator runs right through it.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Roman ruins top white travertine terraces formed by ancient hot springs.

Underwater volcanic eruption forms new island off the coast of Tonga.

The best place to encounter plants and animals that can only be found in New Caledonia.

A white Buddhist temple with a golden restroom.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's deepest subway station is also a stunning ecological wonder.

The library's graceful rotunda is like a bibliophile's temple.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

A whimsical bridge adorned with decorative dragons.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.