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.

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

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

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The curios of pharmacist and collector Henry Wellcome.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This sculpture encompasses the emotion of rail travel.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

A legend says that if this elaborately decorated glass breaks, the good fortune of its owner's household will also disappear.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

This black cat was actually designed to ward off bad luck.

Heralded as the oldest statue in London.

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

This inn of the court provides a fascinating window into London’s legal and architectural history.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

Built by George III to observe the transit of Venus, this Georgian gem is a unique survivor in the Arcadian landscape of Richmond upon Thames.