Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

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

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

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

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.

A masterpiece of Art Deco architecture hidden in plain sight in West London.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A two-way chairlift system between Zugliget and the highest point in the city.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Over the dunes of the Empty Quarter, the mysterious music of the desert.

This remote British Imperial telegraph relay outpost drove men insane.

Different sections of the Zemun Fortress were built in the 14th and 15th century as a response to the advance of the Ottoman Empire.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A pair of connected skyscrapers form this symbolic gateway.

Qatar's oldest market can trace its origins back more than a century.

The enormous diamond-shaped building packs a trove of academic and literary treasures into one futuristic space.

Feed it cash, get your very own gold bar.

This massive piece of artwork weighs more than 250 tons, and was designed as a tribute to the first president of the United Arab Emirates.

Isambard Kingdom Brunel, one of the great Victorian engineers, was the driving force behind the short-lived atmospheric railway.

Old Tudor home moved on thick iron rails to a new spot.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.