Direct answer
Sintra is a compact, UNESCO-listed hill town near Lisbon famed for Romantic-era palaces, Moorish castle ruins, gardens and dramatic landscapes. Plan for steep walking, variable weather, crowds at key sites, and allow at least a full day (ideally 2) to see the highlights.
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Plan for walking, rain and crowds, but don’t rush—allow time to wander small lanes, gardens and viewpoints. With advance tickets, early starts, and comfortable shoes you’ll enjoy Sintra’s romantic charm and spectacular sights.