The last Victorian market in Belfast.

The statue honors a beloved bird that once roamed St. George's Market.

Belfast's namesake river still winds below the city center, hidden from sight.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

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

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

The bones of two medieval royal lions were discovered at the historic fortress.

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

An architectural oddity hides in plain sight on this iconic London bridge.

The Tudor-style cottage in the middle of the square is not quite what it seems.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

An unusual round church in London with a Templar past.

These ornate arches show how the course of the River Thames has changed.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

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

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

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

These engineering masterpieces are a dominant feature of the Belfast skyline.

The only monument to name all of the passengers and crew who died on the RMS Titanic.