This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

The sign at the garden gate reads: "These Plants Can Kill."

A modern English garden of eccentric beasts, follies, and oddities.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

A 30-acre garden inspired by the principles of modern physics.

A 200-year-old prison that now houses a peculiar crime museum.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.