The world's most popular tours for travellers

These are the World's Most Popular Tours

Summer is here and with it, millions of tourists will be embarking on their next travel adventures.

Viator, a travel tours company, recently revealed the top tours booked around the world.

See also: Top 10 landmarks around the UK revealed

See also: Jersey better than Capri: Europe's best islands revealed

It found that the most popular tours in the USA are the Grand Canyon and the Hoover Dam.

The Hoover Dam tour leaves from Las Vegas and the day trip guarantees scenic views.

The world's tallest building is also a hot ticket. The Burj Khalifa Tour in Dubai provides panoramic views of the desert city.

When it comes to the UK, a day trip from London to Stonehenge is one of the top destinations in Europe and you can even book a private tour of the famous rock formations.

And hitting the top of the list is a tour of the world's smallest country: The Vatican City is the most popular tour booked by tourists in 2016.

If this sounds like it's right up your street you can skip the long lines and enjoy the Vatican's museums, Sistine Chapel and St. Peter's Basilica.

Other tours to popular attractions available on the site include the Colosseum, Alcatraz and Mount Fuji among others.

TripAdvisor's 25 best landmarks in the world 2016
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TripAdvisor's 25 best landmarks in the world 2016
"We rounded a wall, and there before me was the city laid out in all its splendor, shining in the bright sun. It was all I had hoped for."

"Grand is an understatement. The architecture, the white marble and the beautifully maintained green gardens are stunning."

"Simultaneously eerie and majestic and in miraculous condition. A truly memorable experience, like absolutely nothing else I've ever seen."

"When you walk into the dome and the light shines through the windows and catches all of the gold, the building begins to glow."

"Simply the greatest architectural achievement on earth, not to mention a testament to love. You haven't lived until you've visited, so don't put it off one minute longer."
"The Mezquita is a stunning architectural masterpiece with the haunting columns and arches of the old mosque juxtaposed with the ornate decoration of the opulent cathedral at its centre."
"The whole church is a piece of art. So colorful outside and even more impressive inside, with mosaics covering every inch."
"Our visit to the Alhambra was one of the most exhilarating experiences of our visit to Europe. The views from gardens are majestic and the palace is stunning. To sit a soak it all up gives you a wonderful sense of it's history."
"An excellent historic attraction with thought provoking experience of what happened, very serene and great views up to the Washington monument."
"What a spectacular cathedral. The inside is impressive and the rooftop makes this a must see."
"An absolute must-see if you're ever in the area. Not only does it give you breathtaking views of the surrounding bay but is a beautiful piece of engineering in itself."
"Jaw-dropping building that takes you back to Constantinople. This is the history of three empires in one place."
"A must visit during the day and night. Great architecture and design, really highlights the glory days of Belgium."
"No matter how many photos, videos, or postcards you've seen of this icon, there is simply nothing like seeing it up close and personal."
"One of the finest examples of French Gothic architecture in the world. It was among the first buildings in the world to use the flying buttress (arched exterior supports). She stands so proud as a silent observer of centennial stories to tell."
"The crowds were sparse, the countryside green and lush and the views of the wall were amazing. Worth every moment!"
"This is a must see venue in Athens--wonderful by day or night. Well worth the price of admission and the walk up the hill. You will not be disappointed."
"The statue is amazing, but the views are even better! Great sunset views over the city and bays, with the sun setting right behind the statue."
"Always a pleasure coming to see this beautiful and well crafted piece of architecture its an amazing sight especially at night."
"The city complex displays all the greatness of the Mayans as architects and master mathematicians. It’s an amazing and humbling place."
"If you miss this temple, you can't really say you saw Bangkok. Absolutely gorgeous. The reclining Buddha really took my breath away."
"A must experience in Dubai for Birds eye view of the beautiful city. The sunsets and sunrises are really special."
"Excellent, courteous and friendly staff. Beautifully maintained and creative displays. Tomb of unknown soldier a humbling place of reflection."
"More than just a Sydney highlight - it’s the Taj Mahal of Oceania. Stroll around the building and watch other visitors being struck by the magic of architecture."
"Even in torrential rain it is worth visiting. From the iconic walkway through hundreds of individual red tori gates, to the peaceful beauty of the gardens.... Wonderful."
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