A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Where Venice's gondolas go for a tune-up.

Two stone columns flank the grand Venice square, but there were supposed to be three.

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

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

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The medieval woodcut-style artwork chronicles life in medieval London.

The bronze uniforms commemorate the vital role of women during World War II.

This ancient Egyptian obelisk still bears the wounds of World War I.

The commemorative stone column conceals a secret laboratory.

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

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.