Dinosaurs before dark —Osborne, Mary Pope, author.

Eight-year-old Jack and his younger sister Annie find a magic treehouse, which whisks them back to an ancient time zone where they see live dinosaurs.

Dolphins at daybreak —Osborne, Mary Pope.

Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.

Mummies in the morning —Osborne, Mary Pope, author.

Jack and his younger sister take a trip in their tree house back to ancient Egypt, where they help a queen's mummy continue her voyage to the Next Life.

Pirates past noon —Osborne, Mary Pope, author.

The magic treehouse whisks Jack and Annie back to the days of deserted islands, secret maps, hidden gold, and nasty pirates.

The knight at dawn —Osborne, Mary Pope, author.

Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.

Polar bears past bedtime —Osborne, Mary Pope.

Their magic tree house takes Jack and Annie to the Arctic, where a polar bear leads them onto very thin ice.

Hurricane heroes in Texas —Osborne, Mary Pope, author.

"Jack and Annie travel in the magic tree house to Galveston, Texas on September 8, 1900--the day of the worst natural disaster in US history"-- Provided by publisher.

Night of the Ninjas —Osborne, Mary Pope.

The magic tree house takes Jack and Annie back in time to feudal Japan where the siblings learn about the ways of the Ninja.

Buffalo before breakfast —Osborne, Mary Pope.

The magic tree house takes Jack and his sister Annie to the Great Plains where they learn about the life of the Lakota Indians.

Christmas in Camelot —Osborne, Mary Pope.

On Christmas Eve, Jack and Annie's tree house transports them to King Arthur's castle at Camelot, where they undertake a quest to the castle of the Otherworld.

Afternoon on the Amazon —Osborne, Mary Pope.

Eight-year-old Jack, his seven-year-old sister, Annie, and Peanut the mouse ride in a tree house to the Amazon rain forests, where they encounter giant ants, flesh-eating piranhas, hungry crocodiles, and wild jaguars.

Narwhal on a sunny night —Osborne, Mary Pope, author.

"The magic tree house whisks Jack and Annie away to Greenland where they discover they've traveled back in time to meet Lief Erikson"-- Provided by publisher.

Vacation under the volcano —Osborne, Mary Pope, author.

Their magic tree house takes Annie and Jack to Pompeii just as Vesuvius is about to erupt, and they must find a Roman scroll before everything is covered with burning ash.

Twister on Tuesday —Osborne, Mary Pope.

When Jack and Annie travel back to the Kansas prairie in search of "something to learn," they gain an understanding of how hard life was for pioneers and they experience the terror of a tornado.

Day of the Dragon King —Osborne, Mary Pope.

The magic treehouse takes Jack and Annie back 2000 years to ancient China, where they must find the original copy of an old legend before the Imperial Library is burned down by the evil Dragon King.

Tigers at twilight —Osborne, Mary Pope.

Having used their magic tree house to travel to India, where they must get a gift to help free the dog Teddy from a spell, Jack and Annie have adventures involving a tiger and other endangered jungle animals.

Late lunch with llamas —Osborne, Mary Pope, author.

"The magic tree house whisks Jack and Annie away to South America, where they must climb Machu Picchu to save a baby llama"-- Provided by publisher.

Sunset of the sabertooth —Osborne, Mary Pope.

Dingoes at dinnertime —Osborne, Mary Pope.

The magic tree house whisks Jack and Annie away to Australia where they must save some animals from a wildfire.

Lions at lunchtime —Osborne, Mary Pope.

The magic tree house takes Jack and Annie to Africa where they meet up with wonderful wild animals, a very hungry warrior, and where they even solve a riddle.