Quite simply the largest tree in the world (by volume).

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An underground city of salt.

Be(w)ar(e) the moat around this historic Czech castle.

Each year, Germany's "City of Dragons" slays the world's largest walking robot.

The world's most active stratovolcano is almost always erupting.

Sweden's "good old days" painstakingly re-created in a model village.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

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

Whitewashed mosque contains the world's largest carpet.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

A magical oasis in the middle of the Negev Desert.

An ancient capital city that dates back 3,000 years and harbors many surprises.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

Come for the flowers, stay for the bats!

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

What was once a unique system of urban elevators is turning into a mechanical ruin.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.