Arguably Belgrade's only example of pure Art Deco architecture.

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

Oriental bazaar in the heart of Sarajevo.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

This narrow fjord-like bay is the largest ria in the Mediterranean Sea.

The secret medieval communication system will whisk your words above the noise of the crowd.

Third time's a charm, or in this case, two testicles are.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

This futuristic building is yet another architectural wonder in Dubai.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This indoor ski resort has a mountain contained inside a mall.

Whitewashed mosque contains the world's largest carpet.

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.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

Ozymandias’ time-keeping temple.

The largest known Ancient Egyptian obelisk.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

This ancient structure is widely thought to be the oldest intact pyramid in the world.