Catacombs turned marketplace.

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

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

This small sculpture honors a shuttered bookshop that was the site of a fiery act of protest.

A bronze statue of a low three-legged seat commemorates a piece of furniture that started a riot.

A miniature of a lighthouse acts as a beacon for what transpires inside this location.

A public art installation with a nautical themed poem, enhances this pedestrian street.

A public art piece that barely gets recognized, but then that might be the point.

A quartet of brightly colored mythical beasts stand sentry at this gateway.

This mundane post marks the old location of the city's main postal hub.

Brass bricks outline the locations of Edinburgh's lost, lively market stalls.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

Scotland's first Masonic lodge may also be the oldest in the world.

This Roman relic was discovered in Scotland by a mudlarking ferryman.

A series of three shiny letters mark the boundary of an old refuge for those being pursued by debt collectors.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

The colorful stairs are made with marble from the world's major quarries.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

This early version of the guillotine was used to execute the man responsible for its construction.

This extraordinary Viking artifact has traveled throughout the city.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The most loyal of little dogs, or a Victorian era publicity stunt?