This huge limestone slab is considered the largest paving stone in Belgium and a relic of the earliest modern paving in Brussels.

The original shop where the iconic Belgian praline was invented.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

This cannonball has been lodged in the church wall since a 1695 bombardment destroyed the city center.

This supermarket offers shoppers a window into the past alongside their groceries.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The house where the writer spent his formative years.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This historic World War II ship is one of only 4 Fletcher-class destroyers remaining worldwide.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Narrowest house in Boston.

This landmark cemetery in Boston was created more than 300 years ago.

The site of Paul Revere's historic two lantern warning.

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

Dedicated to one of the darkest moments in Irish history.

This statue intended for children to enjoy became a minor political spat.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

An ode to Japanese artist Hokusai, with a bit of a comical twist.

A pair of antique trolleys are on display at one of the oldest subway stations in the United States.