The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

This extraordinary geological oddity resembles human-made pavement.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

Clusters of huge boulders in the Australian Outback.

Along the Stuart Highway, two giant sculptures tower over the roadway.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Watch butterflies take flight before you fly.

This poignant tribute to the White Rose movement showcases artifacts related to the heroic anti-Nazi struggle.

Home of the largest single-phase AC generator in the world.

One of only three fountains created by the iconic architect Friedensreich Hundertwasser.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

One of the few guarded stops along the great spice route.

After over 100 years out of service this landmark windmill once again turns as a symbol of Jerusalem's self-sufficiency.

A magical oasis in the middle of the Negev Desert.

A "miracle" that seems to produce more holy fistfights than holy revelations.

This family tattoo parlor has been inking religious pilgrims in the Middle East for 700 years.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

The site of the deadly Triangle Shirtwaist Factory Fire.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.