The Church of Sts Cyril and Methodius stands on Resslova street, and the part people come for is below it. A stone crypt under the nave hid seven Czechoslovak parachutists in June 1942, after two of them had attacked Reinhard Heydrich's car. You can go down into it, and from the pavement outside you can see the ventilation slit the SS fired and gassed through, the marks still in the stone around it.
Jozef Gabčík and Jan Kubiš attacked the car at the Libeň curve on 27 May 1942, and Heydrich died of the wound on 4 June. The parish hid the seven men under the floor of its own church. An informer gave them up, and the building was stormed at dawn on 18 June; none of the seven came out alive. The clergy were executed in September, the Orthodox Church was banned in the Protectorate, and two villages were destroyed in the reprisals.