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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

Pilgrimage site for star-crossed lovers.

Go inside to really appreciate this 500-year-old technological masterpiece.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The monster at the center of the Darwin Center Spirit Collection.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The remnants of a facade from a 19th-century market stall emporium.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

Banksy's image of a naked man dangling from the window of a sex health clinic.

The shop where the girl who inspired the beloved character once bought sweets is now a book-themed commercial curiosity.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

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

Recently restored menagerie of Victorian-era beasts.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

A six-ton wedding present for the King of the Scots.

This king penguin is a knighted brigadier of the Norwegian Army.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

Scattered throughout London are ancient remnants of the city's former bounding wall.