Get ready to learn the secrets behind forgotten buildings. A new docuseries will look at abandoned “architectural achievements” and dive into the reasons behind they were left behind.

Science Channel will release the new series on April 20. A press statement shares all about the new docuseries. Check that out below.

“They were once some of the most advanced structures and facilities on the planet, standing at the cutting-edge of design and construction. Today they are abandoned, dangerous, some of them even deadly. From uninhabited cities to empty factories, these long-forgotten engineering marvels are scattered around the globe. Science Channel uncovers why some of the world’s most advanced architectural achievements were eventually left behind in the all-new series MYSTERIES OF THE ABANDONED, premiering Thursday, April 20 at 10PM ET/PT.

“There are thriving engineering triumphs all around us, but some of the most spectacular structures have been consigned to oblivion,” said Marc Etkind, General Manager, Science Channel. “MYSTERIES OF THE ABANDONED reveals the original ingenuity behind these projects and the truths to why they were left behind.”

Each of the six, hour-long episodes of MYSTERIES OF THE ABANDONED features stories behind engineering wonders, why they were built and the reasons they were eventually left to crumble. Each story recalls the people who originally designed the structure, their historical significance, and why they were ultimately no longer of use. The premiere episode explores California’s Goat Canyon Trestle railway, known as the ‘Impossible Railroad,’ that required the biggest wooden trestle bridge in the world; Ukraine’s Duga, the notorious anti-ballistic missile radar, known as the ‘Russian Woodpecker,’ that still stands in within the Chernobyl Exclusion Zone; and the Grades Goulets Road in the French Alps, an astonishingly narrow and perilous mountain passageway.

Other stories explored this season in MYSTERIES OF THE ABANDONED include: Pennsylvania’s Kinzua Viaduct, a 300-foot-tall, 2,000-foot-long steel bridge built in the late 19th century to transport coal; the White Sands Missile Range in New Mexico, established in 1945 to test out long range rockets; the Barcroft Observatory in California that was constructed in the 1960’s to study the moon and planets at infrared wavelengths; and Hashima Island, a once thriving and now deserted Japanese island with vast amounts of coal beds beneath it.

MYSTERIES OF THE ABANDONED is produced for Science Channel by Like A Shot. Henry Scott is Executive Producer for Like A Shot. Kyle McCabe serves as Executive Producer for Science Channel.”

Will you check out Mysteries of the Abandoned later this month? Tell us what you think.