The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

Gods clash with machines in a power plant regenerated as a museum.

Ancient ruins hidden underneath a modern luxury hotel.

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

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

One of seven Jewish catacombs in Rome and one of only two open to the public.

One of the most important yet well-hidden museums dedicated to the history of medicine.

Jesus' footprints and the first catacombs in the world.

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

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

One of Europe's oldest libraries.

The Tudor-style cottage in the middle of the square is not quite what it seems.

This museum inside a museum tells the story of London's timepieces.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Collection dedicated to brands, packaging and advertising.

This unique, full-sized copy of the Bayeux Tapestry sports a few modern additions, including underwear.

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