The Initiation Wells of Quinta da Regaleira (Sintra/ Portugal)

Quinta da Regaleira is an estate inside a World Heritage protected landscapenear near Sintra, Portugal. The castle itself is a popular tourist attraction but there's more to it beneath the ground.
Two wells spiral deep into the earth like inverted towers. The wells were never used, nor intended for water collection, but for secretive initiation rites. The larger one contains a 27-meter spiral staircase with several small landings. The spacing of these landings, combined with the number of steps in the stairs, are linked to Tarot mysticism. The smaller well contains straight stairs that connect a series of ring-shaped floors to one another.
In addition to the wells there's also various caves, grottoes, tunnels and other monuments located around the castle park.

Giant Boulder Village (Monsanto/ Portugal)

"The enchanting village of Monsanto is located on the side of a mountain in Portugal and is home to an incredible sight. With houses squeezed between gigantic boulders and tiny streets carved through the rocks, the village's appearance hasn't changed in centuries. In 1938 Monsanto was voted "the most Portuguese village in Portugal" in a national contest and, since then, building restrictions have allowed it to remain a living museum. Although it's not easy to reach Monsanto by public transportation, its atmosphere and immense panorama is definitely worth the drive."

Striped houses of Costa Nova (Costa Nova do Prado/ Portugal)

Once used by fishermen- who painted the houses in bright stripes to stand out against the pale tones of the sand - these single storey shacks have over time been converted into beach huts by holiday guests.

Pena Palace (Sintra/ Portugal)

Livraria Lello (Porto/ Portugal)

Livraria Lello was built to be a bookstore in 1881. It has nice wooden stairs in the center, which lead readers to the top of the building. The roof is made of glass, allowing readers to look up at the sky in a 360-degree view.

House of Stone (Fafe mountains/ Portugal)