The F1 Mexican Grand Prix circuit goes right through the middle of this old baseball stadium.

Though the name might suggest otherwise, this is an American cemetery.

A series of abstract sculptures pop up from an otherworldly volcanic landscape.

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

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

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

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

These biodiverse university gardens form a green oasis amid the urban chaos of Mexico City.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

This is the oldest Roman-made bridge in the city still existing in its original state.

This curious, round temple is the oldest still-standing marble building in Rome.

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A forgotten "city of water" underneath the famous Trevi district.

A Nesting Doll of Churches.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

The Pope’s secret escape route.