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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

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

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

Meet the bronze beloved pet to a family of famous peeing statues.

Theme park featuring miniature replicas of European monuments.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Lavish royal estate punctuated with heated greenhouses.

Climb inside an iron crystal magnified 165 billion times its normal size.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A 19th-century horse lover's bequest led to the construction of this unique fountain in Chicago.

This historic hotel invented the chocolate brownie.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.