A freedman baker’s lavish tomb has a relief showing various stages of Roman bread making.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

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

A massive marble foot is tucked away in a small alley near the Pantheon.

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

Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

One could not be blamed for literally walking all over this supposed landmark.

A letterbox installed specifically for the first editor of the Oxford English Dictionary.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

One of downtown Berlin's last reminders of its Communist past.

This 135-year-old weather station studied the effects of the climate on human health.

One of the world's largest collections of pharmaceutical artifacts.

This artistic fountain display pays homage to this area's theatrical history.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Narrowest house in Boston.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This statue intended for children to enjoy became a minor political spat.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."