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

A walk through the historic city center, under the streets of Seattle.

The supreme shrine of the state.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A unique set of caves that spits waves back out into the ocean.

This museum houses two of Mexico's most impressive Aztec monoliths.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

Native Americans built this circle of stones, which was used to predict astronomical events.

A classic carnival ride that was carved to be untouchable.

Home to the deepest rift anywhere on Earth.

New fungal and bacterial species call this deadly lake home.

An entire town preserved as a historic landmark.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

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

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

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

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.