Castelinho de São João do Estoril
Castelinho de São João do Estoril (also known as Castelo de São João do Estoril or Palacete de São João) is a striking 19th-century Romantic revival mansion dramatically perched on the rocky Atlantic seaside cliffs of São João do Estoril along the iconic Avenida Marginal road in Cascais, Portugal. Built during the golden age of Estoril's aristocracy as a luxury summer retreat, the small castle is world-famous across Portugal for a haunting tragedy involving a young girl who fell from the sea cliffs to her death while holding a porcelain doll. Left abandoned for decades after prospective buyers repeatedly fled due to terrifying paranormal activity, the mansion stands as one of the Lisbon coastline's most infamous haunted landmarks.