Babolovo or Babolovka was a dacha of Prince Potemkin in Tsarskoe Selo.
It was in 1780 that Catherine II of Russia presented the grounds adjoining the Catherine Park and the Alexander Park to her then-favourite, Potemkin. A temporary wooden palace was built to house the lovers' trysts. It was rebuilt in stone to a Gothic Revival design by Ilya Neyelov between 1782 and 1785. The Babolovsky Palace was essentially a summerhouse with seven rooms giving on to a park, a quaint octagonal tower and no second floor.
Alexander I of Russia used the palace for his furtive rendezvous with Sophia Velho, a court banker's daughter. He commissioned Vasily Stasov to redesign the palace. The tower was replaced with a huge bath hewn from a red granite monolith. Engineer Agustín de Betancourt had it placed within the room before the walls were constructed. The bath weighed 48 tons and was 196 cm high.
Wikipedia https://en.wikipedia.org/wiki/Babolovo_Palace
Address (Unnamed Road), 196600, Russia
Coordinates 59°42'31.415" N 30°20'40.332" E