This historic Union Pacific Railroad depot is a stunning symbol of American post-Civil War progress.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

A renovated hotel is bringing new life to a nearly-abandoned mining town in Colorado.

The king of U.S. high points towers over every other peak on the continent.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A plaque at the lighthouse where Frederick Valentich made his last radio contact before he vanished without a trace.

All that remains of the first colonial naval ship in Australia is located in a park in Queenscliff.

A memorial to honor those who were killed in a Bastille Day terror attack in Nice.

This ancient theater was once the home of fierce gladiatorial battles.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

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

Granite rocks that concentrate waves into powerful jets.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

WWI hospital ship lost in a cyclone turns up on the coast of Fraser Island, where she remains rusted and forgotten.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

One of the largest Roman settlements in Portugal.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.