Kilmainham Gaol is one of the largest unoccupied gaols in Europe. It opened in 1796 as the new county gaol for Dublin and finally shut its doors as such in 1924. Today, the building symbolises the tradition of militant and constitutional nationalism, from the rebellion of 1798 to the Irish Civil War of 1922-23. The great collection consists of a wide variety of object types, including manuscripts, photographs, newspapers, weaponry, artwork, medals, uniforms and personal effects especially related to the political imprisonment in the 1916-23 period, as well as the experience of women during the Civil War.

A range of treks is available for those keen to explore the jungle in depth. Temperatures can drop to 13°C at night, so bring your own sleeping bag and warm clothing. Proper shoes for varied terrain are essential. Mosquito nets are usually provided. Some treks offer porters to carry your backpack. Consider what you want to experience: options include fish massages, forest reserves, monkey sanctuaries, and white water rafting through the jungle.

Portland is home to the nation's largest wooded urban park—Forest Park. A short hike in, and you'll find it hard to believe that civilization is just steps away. With 70 miles of trails winding through the forest and offering views of the Willamette River, you'll often have nature all to yourself. However, you're also likely to run into locals jogging or walking their dogs—expect to be greeted with a friendly "hello." If you have the time, hike up to Pittock Mansion, a stunning French Renaissance-style château that once belonged to Henry Pittock, a prominent publisher and businessman. Today, the mansion serves as a historic house museum open to visitors, offering panoramic views of the city. Another popular destination within Forest Park is the so-called "Witch's Castle"—the moss-covered ruins of an abandoned stone house. Despite its eerie name, there’s no record of witchcraft here. However, legend has it that its original inhabitant was the first person in Oregon to be sentenced to execution for murder in 1859.