A series of waterfalls create the illusion of perpetual rainfall in this hidden gorge.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A Byzantine-era church hidden in a wooded area below the Acropolis.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

An ancient Greek monument and a Byzantine church coexist inside this cave.

According to legend, this ancient column contains healing properties.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Site of the first radio and telephone broadcasting companies in Copenhagen.

A Reformation-era fiery figurehead once denoted this location as a print shop.

Legend says this sacred tree was a gift from goddess Athena.

The oldest inn in England served brew to the crusaders.

One part local history, 99 parts gruesome haunted house.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

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

This popular square's history as the former site of a church is right beneath your feet.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

The museum houses one of the world's largest shoe collections, boasting over 12,000 pairs.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

The western face was supposedly left clock-less to snub the Welsh.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Fantastic views and thousands of love locks.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.