Visit the Kigali Genocide Memorial

Israel’s Holocaust memorial and museum on the Mount of Remembrance in Jerusalem.

The canal house where Anne Frank hid for two years and wrote her diary, with the original bookcase door.

The hand-dug tunnel under Sarajevo airport that kept the besieged city supplied for three years in the 1990s.

Don Cheadle as the hotel manager who sheltered 1,268 people during the genocide.

Sober memorial village commemorating the Belarusian villages destroyed in WWII.

Choeung Ek memorial outside Phnom Penh, a stupa of skulls marking the Khmer Rouge mass graves.

Memorial arch on the beach where enslaved people were forced onto ships.

Sobering slave-trade fortress, UNESCO-listed.