Pompeii's less famous neighbor is still revealing her secrets.

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

Erotic art covers the walls of the largest ancient pleasure palace.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

This church is named for one of the most dramatic tales in the early Christian church.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Spain's largest bullring offers a unique glimpse at architecture and history.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

The stunning interior of this Gothic church is covered in ornate gold details.

Part museum, part piece of Arthurian-inspired history, this stately hall attracts King Arthur fans from miles away.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

The last resting place of the famous Native American princess is marked by a haunting monument.

Regency-era excess on the English Coast.

The Liverpool street made famous by the Beatles is real.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

The ritual has been performed uninterrupted for nearly 700 years.