The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The mirrored section takes the shape of Hebrew characters when viewed from above.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

A freedman baker’s lavish tomb has a relief showing various stages of Roman bread making.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

This curious, round temple is the oldest still-standing marble building in Rome.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This ancient market is often referred to as the oldest shopping mall in the world.

This statue took 60 years to complete.

This peak in Chapada Diamantina National Park offers the most stunning sunsets.

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

A Tudor-style castle in Brazil holds one of the world's largest armory collections.

The remnants of an abandoned, 19th-century gold mill along Aruba's rugged northeastern coast.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

Metal horses galloping through a London fountain provide a link to the city's past.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.