Fortresses

An annual goat race takes place within the walls of this medieval castle.

The most impressive of Basel's three remaining city gates.

Distressing images of the Last Judgement adorn the walls of this medieval sanctuary named for St. Patrick.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

A nearly impregnable 16th-century fort is one of Goa's oldest.

Once used to protect important Roman trade routes.

The ruins of a 15th-century castle that has seen its fair share of bitter feuds.

Different sections of the Zemun Fortress were built in the 14th and 15th century as a response to the advance of the Ottoman Empire.

The oldest ruins at this castle overlooking Georgia's Terek River Valley date back to the 10th century.

The remains of a 13th-century stronghold built by the Welsh prince known as Llywelyn the Last.

Parts of this palace are upheld by merely palm stems or reeds supported by palm tree beams.

One of the five gates into the fortress of to Shaniwar Wada was renamed to commemorate the 10th Peshwa of the Maratha Empire.

This makeshift concrete bunker is an unusual reminder of the Cold War.

A 2,000-year-old Iron Age fort offers stunning ocean views.

Visit the remains of a 19th-century defensive fort on the British coast.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

In the foothills of the lesser Caucasus, a centuries-old fortress still stands.

Haunted by its violent past, this colonial bastion was the largest Spanish military installation in the Americas.