Stretching 277 miles in length and more than a mile deep, this vast canyon reveals layers of geologic time stacked like pages in a book. Standing on the South Rim, visitors can look out over colorful cliffs and winding trails that have drawn explorers, artists, and travelers for generations. The views change with the light starting with crimson at sunrise, golden at sunset, and every hue in between.

Evidence of our nation's birth abounds in Boston, a hub of revolution that is essentially the oldest city in the United States. Visitors are compelled to walk the 2.5-mile Freedom Trail around the city center, and bear witness to 16 historical locations related to the history of America.

Tunis' white-washed, blue-shuttered buildings hide a treasure trove of Arabic and Ottoman art. Inspect illuminated manuscripts from the Koran, follow the twists and turns of the fascinating old Medina (inner city), marvel at the ornate Palace of Dar Ben Abduallah and the magnificent Djamaa-Ez-Zitouna Mosque, whose 184 columns were "recycled" from the rocky ruins of Carthage.

Long Beach is a major coastal city in Southern California, located south of Los Angeles where the Los Angeles River meets the Pacific Ocean. Its waterfront combines sandy beaches, marinas, parks, and a busy harbor with a dense urban center. The city is known for its broad waterfront, diverse neighborhoods, and strong connections to shipping, aviation, and maritime industries.

Pisa, Italy, is more than just its world-famous Leaning Tower; it's a city where history, art, and culture intersect to create a fascinating experience for visitors. The Leaning Tower, part of the Piazza dei Miracoli or Square of Miracles, is an architectural wonder that draws millions each year. Built as a bell tower for the adjacent Pisa Cathedral, its unintended tilt has become a global icon.