Travel insights and tips on some of the top attractions and best cities in the world

How much do you know about early American history? If you've been searching for a crash course on how a ragtag band of treasonous rebels built one of the most powerful societies in the world, look no further than the National Constitution Center in Philadelphia. Its location in the historic part of the city is within walking distance of the very place the Founding Fathers ratified the constitution almost 250 years ago.

The Battleship New Jersey has a long and storied history of maritime warfare. Visitors eager to climb aboard this seasoned battleship and uncover her secrets will be delighted to take part in the Battleship New Jersey museum experience.

Just minutes from the famed Philadelphia Museum of Art stands the Eastern State Penitentiary in Philadelphia, an imposing 19th-century Gothic structure in which both Al Capone and "Slick Willie" Sutton were incarcerated for their respective crimes.

One of the oldest zoos in the United States, Seattle’s Woodland Park Zoo spans almost 100 acres of pure animal enjoyment. Since 1899, it has delighted guests with over 1,000 animals that originate from all different habitats and geographic locations. Nestled in Woodland Park, this iconic destination is only a few miles from Ballard Locks (Hiram H. Chittenden Locks), another of Seattle's top places to visit.

It's mind-boggling to consider that 71% of the Earth's surface is covered in water. Now, just imagine the variety and number of creatures thriving in the mysterious blue oceans, rivers, and lakes of this planet. Well, you don't have to leave everything to the imagination. In fact, you can see for yourself the magnificent beauty the water has to offer at the historic and renowned Shedd Aquarium in Chicago, Illinois.

Philadelphia isn't just a city of historic landmarks and cobblestone streets — it's a place where legends come to life. Ghosts are rumored to roam historic homes, secret tunnels may (or may not) hide beneath the streets, and some say the Liberty Bell's famous crack comes with a tale far stranger than the official story.