Legend says this sacred tree was a gift from goddess Athena.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

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

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This blowhole is supposedly caused by a trapped monster.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

A giant Troll lurks under one of Seattle's oldest bridges.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

A museum dedicated to the history and exploration of both popular music and science fiction.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A wall of chewing gum moonlights as collective art.

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

It houses the remains of a 17th-century version of the Titanic.

Maybe the only restaurant in the world where your seat will be signed by a Nobel laureate.

Medicinal spa created with the discharge from a geothermal energy plant.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

The flow from this waterfall sometimes comes out of springs below its rim.