You can release a young butterfly at this beautiful indoor garden.

The only castle in North America to ever house European sovereigns.

A colorful "forest" made entirely from three tons of recycled plastic waste.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

This stately clock was gifted from China's last imperial government to the people of Mexico.

This old-school café is famous for serving coffee, chilaquiles, and the Cuban Revolution.

This tiny, tucked-away eatery reflects the history of Mexico's Lebanese immigrants.

These subterranean models show Mexico City's central square during three different eras.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

This museum houses two of Mexico's most impressive Aztec monoliths.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

A grand entrance to one of the world's smallest Chinatowns.

A bronze statue of the famed Prussian naturalist commemorates the year he spent in Mexico.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

An automaton perched above an classic clock and watch store

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A vault of safe-deposit boxes in an old bank has been repurposed as a time capsule of Hispanic culture.

Artist Natividad Sánchez wrote a new ending for one of Roman mythology's tragic love stories.

A celebrity from the late Cretaceous period.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.