Literally traveling around the world

I’ve planned a 155 day trip around the world, leaving Pittsburgh on August 26th and returning on January 25th. Most places I’m staying 7-10 days and I’m planning on taking only a small backpack that weighs under 20lbs. Some highlights include the Blue Lagoon in Iceland, a Thailand national park, day trips to Paris and Mt. Fiji, a Robot dinner show in Tokyo, and Volcano National Park in Hawaii.