The secret city built by the Manhattan Project.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

A historical puzzle lies at the origins of this structure.

This elegant monument to those who fought against fascism is inspired by the shape of the poppy flower.

Strange physical sensations and optical contradictions keep visitors coming back for more.

This 16th-century mosque is the hallmark of the African architectural legacy in India.

A deeply beautiful 15th-century stepwell with a tragic story.

This magnificent stepwell is designed as an inverted temple and adorned with 1,500 sculptures.

An architectural marvel that dates back to the zenith of Indian architecture.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The world’s narrowest house makes for an awkward, four-foot-wide living space.

On the shores of Kyrgyzstan's Issyk-Kul Lake, a family cooks a feast that tells the sad tale of a people's exile.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

This stunning concert hall has become a symbol of Iceland's national recovery.

This historic black and white monastery is one of Bulgaria's architectural jewels.

Macabre astrological automaton clock dating to the late 1400s.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

An abandoned asylum incorporated into a college campus.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Iceland's largest lagoon is home to stunning multi-colored icebergs.