The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

Commonly acknowledged as the only public monument to the Devil himself.

An ancient Egyptian temple in the middle of Madrid, Spain.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

The youngest volcano in Central America.

A flooded Mexican cave that hides a river beneath the water.

The stoutest tree in the world.

This beautifully deceptive waterfall is something far different from what it appears to be.

Mexico's astounding mummy museum with "the world's smallest mummy."

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Every equinox this Maya pyramid puts on a spooky ancient light show.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Concrete strongholds stand guard over the Golden Gate.

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

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

Home to the deepest rift anywhere on Earth.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Home of Howard Hughes' Spruce Goose.