Pripyat, Ukraine

Source: Imgur popolopolos
The town of almost 50,000 was quickly evacuated in the aftermath of the Chernobyl nuclear disaster which was nearby. Visit their famed amusement park, and you’ll come back glowing!
Capela dos Ossos – Évora, Portugal

Source: Nuno Sequeira André/Wikipedia
The “Chapel of Bones” was built by a (super weird) monk in the 1500’s who decorated the building with the bones of an estimated 5,000 of his fellow monks. If that’s not creepy enough, two bodies hang from the ceiling, and one them is a child. Jesus would be proud.
Grand Hotel Prishtina – Pristina, Kosovo

Credit: Kristoferb at English Wikipedia
The marquee hotel in in Kosovo’s capital isn’t so “grand” anymore. During the brutal Balkan Wars of the 90’s, Serbian militants used the hotel as a place for the torture and execution of their prisoners. Their Trip Adviser rating took quite the hit.