The Fronteira Palace, also known as the Palace of the Marquis of Fronteira, is a beautiful 17th-century palace located in Lisbon, Portugal. It is one of the most stunning Baroque-style palaces in the city and is a perfect example of the grandeur and elegance of the Portuguese aristocracy during the 17th century.

The palace was built by the Count of Redondo in 1671 and was later sold to the first Marquis of Fronteira. It is still owned by the Marquis of Fronteira family and has been passed down through generations. The palace was declared a national monument in 1910.

The Fronteira Palace features an impressive façade, a stunning entrance hall with Portuguese tile work, beautiful gardens, and a gallery of hunting trophies. The palace also has a chapel, an armory, and a ballroom. The gardens of the palace are also a must-see, with fountains, lakes, topiary gardens, and an orchard.

The palace is open to visitors and guided tours are available. It is also a popular venue for special events and private functions.