An ancient knight and a symbol of the city's freedom.

Longest fortress system anywhere in Europe.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

By night, this auto repair shop turns into a taquería serving up some of the city's finest al pastor tacos.

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.

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

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

Where layer cakes tower above one’s head and there is never a shortage of icing.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

These enigmatic columns tower over the ruins of an ancient Toltec city.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Giant topiary dog once played a role in a terrorist bomb plot.

A 16th-century Andalusian palace.

A beautiful example of 18th-century engineering still standing tall.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

A rather vulgar example of the transition from Latin to the Italian vernacular.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.