Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

Beautiful public park off the beaten path and away from tourists.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

This 17th-century Portuguese fort now houses a nautical museum.

This public elevator links the lower city to the upper city of Salvador.

This monumental work of art symbolizes the coming together of a previously divided city.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Metro station with a claim to rock n' roll fame.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

Cold war icon and onetime "hole" in the iron curtain.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This exquisite, alienesque piece of Soviet architecture is being threatened by modern shopping malls.

A tribute to a Ukrainian heroine who went undercover and killed several Nazi operatives.

Kyiv's answer to Muscle Beach is a Soviet-era gym made from scrap metal.

This underground transport hub doubles as an art gallery.

This oddly shaped building is a surprising Soviet-era crematorium.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

This hill is known for its connection to the occult in Slavic tradition.

The deepest metro station in the world.

When you've got to go, you've got to go.