Auschwitz

Work Makes You Free ("Arbeit Macht Frei") is one of the first things you notice as you approach Auschwitz's front gate. When seeing the largest Nazi concentration camp and extermination facility, the grim irony creates a tense atmosphere.

The property is around 30 miles from Kraków's international airport and is situated on the outskirts of the Polish city of Owicim in the south. The historically accurate grounds feature the infamous gas chamber remnants and are divided into the Auschwitz and Birkenau halves of the old camp. Visitors must act appropriately solemn and respectfully; in other words, this is not the place to take pictures with your duck lips on Instagram.

Although the Holocaust's atrocities are tough to comprehend, there is a valuable lesson for all of humanity to learn from it. The best way to put it is maybe in the words of Spanish philosopher George Santayana: "Those who cannot recall the past are destined to repeat it."

• Country: Poland