The world's largest underwater restaurant is submerged off the southern tip of Norway.

Walk 2,300 feet above the ground on the "Troll's Tongue."

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

An underground city of salt.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

The highest point in Florida is still the lowest high point in the country.

A building so large that it has its own weather.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

These spartan apartments are provided to clergymen visiting Vatican City.

Breathtaking and huge 430 year old maps of Italy.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

A massive marble foot is tucked away in a small alley near the Pantheon.

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

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

The former home of Norway's greatest romantic composer.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Tens of thousands of tiny bottles stuffed with various items.