Dublin’s landmarks are an integral part of its identity, reflecting both its ancient history and contemporary vibrancy. Among the oldest and most significant is Dublin Castle, founded in 1204 by King John of England following the Norman invasion of Ireland. Originally constructed as a defensive fortress, the castle played a pivotal role in the city’s administration and the protection of the King’s treasure. By 1230, it was largely complete, featuring a Norman courtyard design with defensive walls and circular towers, and was strategically located near the River Poddle for added defense.

One of the most modern symbols of Dublin is the Spire of Dublin, also known as the Monument of Light. Standing at 121.2 meters (398 feet) tall, this sleek stainless steel spire, completed in 2003, replaces the Nelson's Pillar that was destroyed in 1966. Located on O'Connell Street, it serves as a beacon for the city, symbolizing Dublin’s place in the 21st century. Designed by Ian Ritchie Architects, the spire’s elegant simplicity and dynamic form combine art and technology, lighting up the skyline at night.

Another key landmark is the Old Library at Trinity College Dublin, home to the renowned Book of Kells, a manuscript created by Irish monks around 800 AD. This historic manuscript attracts visitors from around the world and highlights Dublin’s long-standing cultural heritage.

Among Dublin’s many other famous landmarks is the Ha'penny Bridge, an iconic iron footbridge over the River Liffey, known for its elegant design and frequent appearances in photographs. Christ Church Cathedral and St. Patrick's Cathedral stand as symbols of Dublin's deep-rooted religious history, while the Mansion House remains an important political and ceremonial center.

The Molly Malone statue captures the spirit of Dublin's iconic figure, and Leinster House, along with the nearby National Museum of Ireland and National Library of Ireland, form a complex that continues to shape the city's political and cultural landscape. Other significant landmarks include the Custom House, Áras an Uachtaráin, and the Anna Livia monument.

Perhaps one of the most visible features of Dublin’s skyline are the Poolbeg Towers, towering over the city from various vantage points. These monumental chimneys, located near Dublin Bay, have become a striking symbol of the city's industrial past.

From medieval structures like Dublin Castle to modern marvels like the Spire of Dublin, the city’s landmarks not only celebrate its historical legacy but also highlight its ongoing evolution. These sites continue to shape the character of Dublin, serving as important cultural and architectural touchstones for both locals and visitors alike.