1. Ha Long Bay is a UNESCO World Heritage Site located in the Gulf of Tonkin, in the northeastern region of Vietnam. It is known for its scenic beauty, consisting of thousands of limestone islands and islets that rise out of the emerald waters of the bay. Visitors can take a cruise or kayak through the bay to explore its natural wonders, including hidden caves, grottos, and lagoons. Some interesting facts about Ha Long Bay include:

- It is home to several species of plants and animals that are unique to the area, including a number of endemic species.

- The bay has been inhabited by humans for thousands of years, and evidence of ancient settlements and trading ports can still be seen today.

- In addition to its natural beauty, Ha Long Bay is also steeped in legends and folklore. One of the most famous stories is that of the Dragon King, who created the bay by summoning dragons to help him dig the earth and carve out the islands.

Hanoi is the capital city of Vietnam and is known for its rich history, cultural heritage, and vibrant street life. Some interesting facts about Hanoi include:

- The city was founded over 1,000 years ago and has served as the capital of Vietnam for most of its history.

- Hanoi is home to a number of historic landmarks, including the Temple of Literature (a Confucian temple dating back to 1070) and Ho Chi Minh’s Mausoleum (where the former Vietnamese leader is interred).

- The city is known for its street food, which includes dishes like pho (a noodle soup), bánh mì (a sandwich), and bún chả (grilled pork and noodles).

- Hanoi is often called the \"Paris of the East\" due to its tree-lined boulevards, French colonial architecture, and romantic atmosphere.

2. The working hours and phone numbers of specific attractions in Ha Long Bay and Hanoi may vary. It is recommended to check with the individual attractions for their specific schedule and contact information.