A sixth-century Byzantine cistern hidden below a modern carpet store.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Turkish adventurer antiques in the heart of the Grand Bazaar.

A stone plaque and a winking pub name are all that remain to remember the victims of deadly 1836 avalanche.

This monumental neo-Renaissance tomb in Vyšehrad Cemetery is the final resting place for Czech cultural legends.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

This giant geoglyph of mysterious origins is now the site of neo-pagan rituals.

This seaside property, an example of Art Deco Streamline Moderne style, was designed to embody the curves of a great ship.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Hidden beneath the streets of London is a secret subway that only carried mail.

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

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

One part local history, 99 parts gruesome haunted house.

The broken skateboards that became a poignant memorial to a murdered skater.

This 500-meter-long memorial pays tribute to the hundreds of thousands of lives lost to COVID-19 in the UK.

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

An archway adorned with vulnerable flora and fauna.

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

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This is London's smallest listed building.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

As seen in the Spice Girls ‘Wannabe’ music video.