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

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

What's that on the side of that building? Va Va Voom, it's Bettie!

Dramatic river bend surrounds a natural red-rocked pedestal.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

This church was constructed by a shipbuilder and designed like an upside-down boat.

The unusual patterns in this rock formation result from two distinct modes of weathering.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

This mighty white oak in Bethesda survived both the American Revolution and the construction of Washington D.C.'s metro red line.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Ancient serpentine sacrifice holder that has stood the test of time.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Quite possibly the oldest love poem known to humankind.

1513 Turkish world map, full of European state secrets and snarky commentary.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.