Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Mountain where Jesus was first tempted by the Devil.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This expansive bridge in the Canadian wilderness was originally just built for friends.

A miniature city, once ruled by the Queen of the Netherlands.

Historic funicular railway, believed to be the shortest railroad in the world.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Elevated freight railway turned wildly successful urban park.