This ancient octopus-like tree was saved from destruction thanks to shady reporting.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

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

Where commuters walk through remnants of an ancient Greek necropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

Longest fortress system anywhere in Europe.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

This Scottish museum is the only one in the world to focus not on one religion but all of them.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Eighty million natural history specimens call this gargantuan museum home.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.