On a metal balcony overlooking Argentina's Iguazu Falls, everyone is leaning over the balustrade to get a picture. Most are bent on getting an image of their gurning faces in front of a particularly voluminous fall known as the Devil's Throat.
Stills and film clips will be shared with friends and family across the world. Everybody wants to show how special their holiday is.
Overtourism - the concentration of large numbers of people at notable sights of interest - has always been with us. But there's something about the digital age that highlights it: an irrepressible urge to spam the entire world with imagery, voice messages, social-media updates and tweets.Such herd behaviour is manipulated by the travel industry, which has the most to gain by concentrating people in limited places.
It doesn't have to be like this. Over two decades of travelling around Latin America, I have seen many examples of responsible, thoughtful tourism, usually as a result of intelligent collaboration and community co-operation.
INTO THE UNKNOWN
One instance was right there at Iguazu. I was staying at the new Awasi Lodge, a five-star, 14-villa, wood-framed hotel in dense jungle, with space for just 30 guests. The ethos of Awasi, in Iguazu and at its properties in Chile and the Atacama Desert, is worth noting."We want to open up the region," Matías de Cristôbal, Awasi's director, told me. "Ninety percent of visitors want to see the falls. It's our challenge to take them to unknown parks."
I stumbled upon no crowds while birding with a guide in the Urugua-í Provincial Park. I saw maybe three cars on the red dirt road through the virgin rainforest. I saw only two other people - locals - at the rehab centre for rescued, injured and ex-zoo animals.
Machu Picchu, another crowd magnet, has found ways to take the pressure off the famous Inca Trail and the citadel itself. Limiting the number of hikers on the trail to 500 per day is the key control. By not building a road into Machu Picchu, and encouraging a range of rail options, the Peruvian tourist board exercises more control over its best-loved national park than do authorities in countries that are far less reliant on the tourist dollar.The authorities have also promoted alternative trails and campaigned to get people to think about visiting the archaeological sites at Choquequirao and Kuélap.
FORGOT TO GO
My last trip to the region, in 2016, involved a stay at the all-inclusive Explore Sacred Valley lodge. I climbed a mountain, visited three lesser-known ruins, and cycled into the valley. I "forgot" to go to Machu Picchu. Seriously. I just didn't want the crowds.But tour operators and boards can't take all the blame. We travel journalists have also generated demand for a specific kind of experience.
It's urgent we now work together to focus attention on off-radar places and ideas. Travel need not be a box-ticking, bucket-listing exercise. Why chase jaguars round a boat-jammed channel in the Pantanal when you can look for them quietly on terra firma?Why join the rat-run up to the summit of Sugar Loaf when you can go up one of the lesser-known granite morros in Rio and enjoy the same view?
NEW WAYS TO ROAM
If I can claim special insight, it's down to Patagonia, a region with no easy "sells". I'm talking about the steppe, not the turquoise lakes and the glaciers. Inland Patagonia has few wild animals, few spectacular attractions. It's lonely and harsh yet mesmerising. Why? Because it compels visitors to make an effort. Or as Paul Theroux puts it in The Old Patagonian Express: "The landscape taught patience, caution, tenacity . You had to choose between the tiny or the vast."
One day, virtual holidays may well replace this gas-guzzling, laborious, environmentally crazy pastime we call tourism. Until then, we'll have to find ways to adapt to being so numerous and free to roam. It's time to visit empty, difficult, unphotogenic landscapes, cliché-free, forgotten, remote towns and cities and forests and shores lacking in infrastructure and home comforts.
It's time to indulge in the luxury of the less obvious - that is, it's time to travel. - The Daily TelegraphTIPS TO AVOID CROWDS AT TOP ATTRACTIONS
GORILLAS IN THE RAIN
Gorilla trekking has become one of the world's bucket-list adventures and crowd pressure is increasing. But if you head to Bwindi Impenetrable National Park in Uganda in the rainy, low season, (April, May, November) your permit will cost $150 less than in high season, according to CNN Travel.VENICE IN WINTER
The best time to visit La Serenissima is when the winter mists settle on its squares and canals. That's when the tourist hordes desert the city and hotels slash their room rates. Better yet, everything takes on a ghostly, abandoned air. Sure, it's cold and dank and the days are short. Better that than selfie sticks.MOVE OVER, MONA
If you're prone to panic in big crowds, skip the Mona Lisa in the Louvre in Paris - the jostling and the crush and idiot selfie-takers will ruin the moment. Go around the corner to Géricault's Raft of the Medusa - one of the world's finest epic paintings - and it may feel like you have the museum to yourself. The Louvre has lots of places free of the crowds.
OFF-THE-BEATEN TRACK IN SA
A WINDPUMP FIELD
Too few people trek up to Loeriesfontein, near Calvinia. That's too bad because the Fred Turner Museum - a field of 30 or more classic, restored windpumps spinning and cranking out their retirement in the breeze - is one of SA's most captivating sights. 
THE R74 TO MEMEL
The short-cut from Newcastle over the 'Berg to Memel in the Free State is one of the most beautiful and car-free roads in the land, with the looming bulk of Majuba Hill, site of a blood-soaked battle, gazing implacably from the north. The road leads into secret valleys and past farms spread out under a Pierneef sky. - Paul Ash..