Hidden in plain sight, this lush garden sits atop one of the most iconic buildings in São Paulo.

Ella Fitzgerald, opera singer Enrico Caruso, and dancer Isadora Duncan all performed in this lavish, supposedly haunted theater.

This skyscraper once housed weapons during the revolution and was the scene of two brutal crimes that shocked São Paulo society.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Go take a picture with the inventor of the daguerreotype photographic process.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

One of the last mosaic tile facades found in the city.

This coffee shop lies hidden beneath a historic church.

Rock carving created 1,300 years ago 75 feet off the ground.

A vast Communist-era exhibition space in the Bulgarian capital.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

An underexplored, 130-foot tropical waterfall that you will have all to yourself.

The fighters and conspirators that won independence for Paraguay held secret meetings at this historic house.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

A huge boat-shaped hotel with a blood red pool and other oddities.

A labyrinthine museum chronicling the history of African culture in Brazil.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.