The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This ancient market is often referred to as the oldest shopping mall in the world.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The curiosities and wonders of pharmacy in a delightful historic building.

It's believed this golden brick is part of the legendary lost Aztec treasure.

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

CDMX's home for the world's culinary delights.

A barbarous band of serpents guard the bases of these Aztec temples.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

66,000 pieces of art, donated by one of the world's richest men.

Frida Kahlo's childhood home, now a museum of her life and works.

Alexander Hamilton’s creation caused quite a bit of controversy.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Why walk on this historical site when you can zoom down instead?

The most famous location in China was home to whole dynasties worth of imperial rulers.

This 16th-century mosque is the hallmark of the African architectural legacy in India.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.