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

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

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

A beautiful geyser under environmental threat.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Quite simply the largest tree in the world (by volume).

This historic national park is covered in the stunning ruins of red rock pueblos.

See massive fossils that are over 200 million years old in northeastern Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

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

This cross marks the site of a 16th-century Portuguese gunpowder factory.

Believed to have been the longest bridge in the world when it was completed in 1634.

This 16th-century hilltop chapel is one of the oldest churches in Old Goa.

All that remains of a 16th-century Jesuit school is this carved, worn gate.

This chapel was built by Afonso de Albuquerque in 1510 to commemorate his entry into the city of Goa on St. Catherine’s Day.

The ruins of a 17th-century Carmelite Convent atop a hill in Old Goa.

This 19th-century heritage building once housed a department store that supplied British provisions in the city.

The ruins of what is considered the world's oldest university.

An architectural marvel that combines Gothic architecture with Indian elements.

A tribute to one of Bombay's former governors that has withstood the test of time.

The ruins of a medieval citadel believed to be haunted by a ministry of wish-granting djinns.

An astounding 13th-century architectural and historical achievement

The lone remnant of a 16th-century palace in Old Goa.

These animal carvings stand as a representation of India and Britain.