Toompea Castle (Parliament)

Perched dramatically on Toompea Hill, this centuries-old fortress serves as Estonia's Parliament and blends medieval stone walls with 18th-century baroque additions that create a striking silhouette against Tallinn's skyline. While the interior remains largely off-limits to visitors, the exterior and surrounding Toompea district offer glimpses into medieval architecture and Estonian independence, with the distinctive Danish flag carved into the castle wall serving as a poignant historical marker. The adjacent viewing platforms provide some of Old Town's most breathtaking panoramas, especially when the city lights twinkle at dusk.