Once a federal prison housing dangerous and notorious criminals, Alcatraz (The Rock) now welcomes tourists into the cell blocks once occupied by the likes of Al Capone, Machine Gun Kelley, and the Birdman of Alcatraz. Self-guided audio tours have dramatic narratives of Alcatraz’s grim history, including realistic sound effects one would hear in prison. Apart from the prison complex itself, Alcatraz Island essentially operates as a national park. You can spend a full day hiking, taking in the view from multiple observation points and appreciating the natural beauty.

No visit to San Francisco would be complete without a ride on a cable car. These cable-powered streetcars have been transporting people up and down the hills of San Francisco since 1873. A highlight of the ride is actually at the end (or the beginning) at the turnaround. Watch while drivers push the cable car on a rotating platform 180 degrees for the trip back up the hill.

If you're up for hiking in the fresh air, climbing Mount Qingcheng is the ideal activity for your trip to Chengdu. The mountain is the cradle Taoism and is considered sacred according to the Taoist culture. There are dozens of Taoist temple hides under the greenery, some abandoned, some are still prosperous.