Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Quito's historic, main square dates back to the 16th century.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

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

The famous aviator's final resting place is a study in natural beauty.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

When ecosystems collide in the arid Southwest.

Palace where the nearly un-killable Rasputin was murdered.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Stockholm's tiniest statue is of a small boy looking at the Moon.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A subterranean house of worship carved right out of the bedrock.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

The vast, legendary catacombs hold secrets much stranger than stacked bones.