This ancient Egyptian obelisk still bears the wounds of World War I.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

London's smallest police station is barely the size of a phone booth.

Hear the quietest sound from across the dome.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

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

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.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

Home of the world's smallest dinosaur footprints.

Canada's largest dinosaur skeleton was hidden away in storage for more than 40 years.

Now a public art piece, this curious metal feature originally advertised a tinsmith's services.