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.

The Oregon Museum of Science and Industry (OMSI) is a gigantic playground for both adults and children. Focusing on natural sciences and technology, the museum features several labs in five exhibition halls – chemistry, paleontology, space, and more. You can also explore the USS Blueback Submarine and a planetarium. The Empirical Café and Theory Restaurant will provide you with refreshments if needed.

Dukhan is an industrial city in Qatar’s western region and that became popular when oil was discovered there. Almost all the people who live there are employees of Qatar Petroleum. The city is off limits for others and photography is not allowed within Dukhan. The area around Dukhan is, however, very popular with visitors as there are lots of interesting sites and attraction to see in the area.

An embodiment of the iconic Greek white-with-a-blue-dome, postcard-ready look that dominates postcards, this structure is set atop a high hill and dates back to the 18th century.