Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This striking, historic hotel has major Wes Anderson movie energy.

This small bronze pyramid marks the center of Belgrade, but some say it is a Masonic symbol.

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

A misnamed well, with a deep dark past.

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 pair of connected skyscrapers form this symbolic gateway.

A retro Yugoslav congress, cultural, and business hall built in the 1970s, with an iconic world clock.

This art installation pays homage to the famed stones of European lore.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

An idyllic traditional timber village on a picturesque hill was built for a film.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

The largest aviary in Southeast Asia is a green haven in the heart of the city.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

Climb to the top of the world's largest seated bronze Buddha.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The grand 14th-century gateway to the lost abbey of St Edmund

A large piece of modern art makes this roundabout the only one in the world with its own laser.

A remarkable medieval structure born from a 14th-century disaster.

This striking steel sculpture transforms environmental data into art.