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Each passing month brings . Here are 10 destinations that are best visited in October.

1. Witness The Fall Monarch Butterfly Migration In Mexico And California

Around October every year, monarch butterflies migrate south and west to Mexico and Southern California, where they escape cold winters. According to the U.S.Forest Service, some butterflies​ to reach their winter home, traveling by day and roosting in pine, fir and cedar trees by night. Visitors can see these wintering butterflies at the and in the eucalyptus groves along the Pacific coast of California near Santa Cruz and San Diego, such as Natural Bridges State Beach, which is a.

2. See Breathtaking Petra In Jordan

October is one of the best times to visit the amazing of Petra. The weather is still sunny and warm, allowing you to sleep out under the starry skies or take a nighttime tour, yet still cool enough to enjoy the journey into the Valley of the Moon on camelback. Plus, there are seldom any large crowds this time of year.

3. Go Whale Watching On Argentina's Peninsula Valdes

Head to this October and you have the opportunity to see majestic southern right whales, which . The peninsula is a , important because of its role in the conservation of marine wildlife. October visitors to this South American fauna reservation also have a good chance of spotting elephant seals, penguins and orcas this time of year in the same area.

(​MORE: The Best Fall Hikes In The US)

4. Experience England's Stunning Lake District

As the United Kingdom's most popular national park, The Lake District is a for its craggy hills, mountain tarns and glistening lakes. However,there is perhaps no better time to visit than in the fall, when this English landscape bursts into fiery colors while the mist and woodsmoke gives the area an almost mystical appearance.

5. Celebrate Elktober In Estes Park, Colorado

Surrounded on three sides by Rocky Mountain National Park, is home to one of the country's largest wild elk populations and by throwing an elk-themed festival, or , during 'the Rut' (the elks' mating season). Visitors this time of year have the opportunity to not only see the animals up close (especially male elk), but also partake in festival activities such as bugling contests.

6. Explore The Greek Dodecanese Islands

The Dodecanese Islands are the most southerly of the little Greek Islands, meaning that they usually still experience hot and sunny weather into October. As a result, this is the perfect time to explore these unique islands, , giving them an authentic Greek feel, according to Lonely Planet. The most popular island is Rhodes, known for its cobbled capital of Lindos and ancient ruins, but Tilos is the best place for naturalists to explore and Kalymnos offers divers great underwater caves and ancient wrecks to explore.

7. Attend Bridge Day In West Virginia

Held on the third Sunday in October,marks the day when more than 350 BASE jumpers hurl themselves off America's second-highest bridge, the New River Gorge Bridge in West Virginia. The bridge is 876 feet high, giving the jumpers, according Lonely Planet, before they land either in the rapids below (nicknamed the “River of Death”) or on a patch of the rocky, tree-filled shoreline. This year, the event will be held on Oct. 21.

8. See The Trailing Of The Sheep In Idaho

Held in Idaho, the Annual Trailing of the Sheep Festival observes theanimals’ annual migrationto the southern part of the state. Attractions at this fun fall festival include the sheep parade, , and the Championship Sheepdog Trials. This year, the festival takes place from Oct. 4-8.

(​MORE: Fall Foliage Map Tracker: Current Status And Peak Times)

9. Relax In Ibiza, Spain, Without The Crowds

By October, most of Ibiza's summer tourists are gone, leaving Ibiza relatively uncrowded this time of year. So whether you want to relax by the water before it gets too cold, party at one of the island's famous clubs or just explore the , this is a destination that should not be missed this month.

10. Visit Kolkata, India, During The Hindu Festival Durga Puja

In West Bengal, Kolkata is locally regarded as , according to Lonely Planet, renowned for its colonial-era architecture and Bengali cuisine. In October, it is also famous for its Durga Puja (also known as Dussehra) celebrations. Durga Puja is .

M​ORE ON WEATHER.COM

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-​ Best Fall Drives Across The U.S.

-​ This Fall’s Foliage May Be Brighter Than Normal

-​ Best Viewing Spots For ‘Ring of Fire’ Eclipse

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