Regaleira Palace in Sintra, Portugal

Perched atop the Sintra Mountainside, this Romanticist palace boasts eclectic architecture featuring Moorish Revival elements such as white walls adorned with intricate carvings of foliage and geometric shapes, red-tiled roofs, and distinctive twin chimneys. Below it lies an enchanting garden with waterfalls that cascade down to the lush valley below, while visitors wander around marveling at its beauty against the backdrop of the Atlantic Ocean horizon under a bright blue sky dotted with wispy clouds.