A popular European tradition makes its way to the states on one of America's most famous bridges.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

Padre Delgado, a leader in the fight for Salvadoran independence, is buried in this stunning Brutalist cathedral.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.

This sprawling, Brutalist estate feels like a city within a city.

Abandoned railway line circling the city of Paris.

This massive library holds what was once the largest book collection in the world.

An ill-fated attempt to grow wheat in the sagebrush steppe of northeastern Nevada.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

Once disputed as the largest sundial in the world.

A historic hydroelectric power plant serves as the unusual backdrop for a public park.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

This small, unassuming street is now a canvas for color and creativity.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Only hotel where you can legally launder money.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

San Francisco's newly reopened hands-on science museum.

Tiki luxury on Nob Hill.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.