TV Guide Yesterday Sunday

Michael Portillo visits Yosemite National Park in California, beholding its towering granite cliffs, giant sequoia trees and cascading waterfalls. He then heads to the University of California's seismology department to hear about the devastating 1906 San Francisco earthquake, which claimed the lives of approximately 3,000 people and destroyed more than 80 per cent of the city

Michael Portillo continues through southern California aboard the Coast Starlight rail service. In the port of Monterey, he discovers the city's Spanish and Mexican heritage, before heading to Paso de Robles, where he tours Hearst Castle, dream home of the newspaper baron, William Randolph Hearst. In the hills of Morro Bay, Michael joins avocado farmer, Jim Shanley, amid his 4,000 avocado trees to harvest the pears and learn how to make guacamole. Arriving in Los Angeles, Michael heads for the Warner Brothers studio, founded on Sunset Boulevard

Paul Merton and Suki Webster explore the New Forest, encountering 'commoners' Tess and Ollie, who have earned the right for their ponies to roam freely in the area. With the help of farrier Ben, Suki learns how to remove a horseshoe and takes home her own bit of luck, and the couple visit hives in Hythe for a spot of beekeeping

Paul Merton and Suki Webster explore Devon, beginning by heading to Dartmoor national park to meet a local guide for a Sherlock Holmes-themed tour, as It was in the national park that Arthur Conan Doyle was inspired to write The Hound of the Baskervilles. Paul and Suki also meet Kate and Norman, who are part of the Wheeled Access group, which encourages anyone with a disability to get out and enjoy the area

Footage of marine life in different environments around the north, beginning with a tropical coral reef which has medicinal properties for dolphins, and is used as a tool by tusk fish. In Japan, a shipwreck is home to the Asian sheephead wrasse, which can change gender, while in the polar north, walruses struggle to find ice floes for their pups to rest on as climate change takes its toll on the environment

Creatures that live in volcanic hot spots on the ocean bed, areas that reach temperatures hot enough to melt lead and which may hold the secrets behind all life on Earth. Other strange creatures from the depths of the sea include bone-eating worms, fish that walk rather than swim, and hordes of squid. Plus, footage of sharks in a feeding frenzy over the dead body of a whale and the wildlife of the Midnight Zone in the Pacific, an area that never receives any natural light, forcing creatures to rely on their own bioluminescence

Creatures that live on coral reefs, including groupers, small predators that scientists believe are as intelligent as chimpanzees. These creatures have a remarkable aptitude for communication to the point where they can interact with other species including octopi and work together to catch prey. Plus, footage of a vast spawning event involving several different species of fish, coral and invertebrates, and time-lapse photography of coral polyps growing and dying, creating a structure visible from space

Wildlife that live thousands of kilometres from land, featuring footage of baby turtles using debris as life rafts and whales sharks embarking on lengthy voyages across the Pacific to the point where it is safest to give birth. Special pressure-proof cameras are used to film sperm whales hunting for squid a kilometre beneath the surface and the impact of plastic pollution on the oceans is revealed

Footage of wildlife inhabiting underwater kelp forests, including thousands of giant cuttlefish spawning along a restricted area of rocky reef off the south coast of Australia. Males outnumber females 11 to one, which leads to fierce competition. Larger males use brute force to drive off competition, while their smaller rivals use deception by mimicking the appearance of females. The programme also features tiger sharks hunting for green turtles in fields of seagrass and spider crabs trying to avoid predators while they shed their shells