The underground Catacombs of Paris are a popular tourist attraction known for their underground labyrinth of tunnels and skeletal displays. If you're visiting the Catacombs and would like to explore the surrounding area, here are some things to see:

1. Montparnasse Cemetery: Located nearby, this cemetery is the final resting place of many notable figures, including Jean-Paul Sartre, Simone de Beauvoir, and Charles Baudelaire. It's known for its beautiful monuments and peaceful atmosphere.

2. Luxembourg Gardens: A short distance from the Catacombs, these gardens offer a tranquil escape from the bustling city. You can stroll through the well-manicured lawns, admire the Luxembourg Palace, and relax by the fountains.

3. Pantheon: Situated in the Latin Quarter, the Pantheon is a neoclassical mausoleum that houses the remains of several distinguished individuals, such as Voltaire, Rousseau, and Marie Curie. The building itself is an architectural marvel worth exploring.

4. Sainte-Geneviève Library: Adjacent to the Pantheon, this historic library is known for its stunning reading room and extensive collection of books. It's a great place to appreciate both the architecture and the intellectual atmosphere.

5. Notre-Dame Cathedral: While it is currently closed due to restoration work following the fire in 2019, Notre-Dame Cathedral remains an iconic landmark in Paris. It's worth visiting the area to admire the exterior and take in the surrounding views.

6. Jardin des Plantes: This expansive botanical garden is located close to the Catacombs and offers a variety of attractions, including beautiful flowerbeds, greenhouses, and the National Museum of Natural History. You can explore the gardens or visit the museum's exhibits.

7. Left Bank: Crossing the Seine from the Catacombs, you'll find yourself on the Left Bank, known for its bohemian atmosphere. Enjoy the charming streets of the Latin Quarter, browse the independent bookstores, and discover cozy cafes and jazz clubs.

8. Paris Catacombs Museum: While technically part of the Catacombs, the underground museum provides additional context and historical information about the site. It's a must-visit if you're interested in the history and significance of the Catacombs.

Remember to check the opening hours and any specific visiting requirements for each attraction before your visit, as they may be subject to change. Enjoy your exploration of the Catacombs and its surroundings!