This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

This Civil War monument was designed by an eccentric architect and Gettysburg veteran.

A diorama of the Civil War, fought by cats.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

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.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

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

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

A large replica of a monumental Roman inscription is located on the side of this museum.

This large, circular tomb is the final resting place of the first emperor of Rome.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

An elegant church is home to a remarkably detailed mosaic floor depicting the Garden of Eden.

The glowing blue Nymphaeum of Emperor Tiberius.

This clifftop arch is a natural stunner.

This bronze boy sits on one of Capri's rocky cliffs, waving at the passing boats.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

It holds a fabulously designed tribute to astronomer Edmond Halley.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

At almost 1,000 years old, this is the oldest known door in all of Britain.

The bones of two medieval royal lions were discovered at the historic fortress.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.