Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

Regency-era excess on the English Coast.

One fisherman has used his love of pebbles and shore to create a crazy garden of rocky art.

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.

A vintage penny arcade hidden in the back of a fun fair-themed bar.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

These seaside shelters once enjoyed by royalty remain a part of local history.

Hidden in plain sight, this creepy sculpture watches from above.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

This 11th century tower is said to be the oldest building in Oxford.

The spot where Oxford garnered its name was also home to a medieval philosopher and includes a house covered in statues.

This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

The UK's oldest theme park slowly slips away.

This monumental work of art symbolizes the coming together of a previously divided city.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.