A spiralling hourglass-shaped tower rises from the forests in Denmark.

Home to the oldest operating roller coaster in the Southern Hemisphere.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

Once an ancient sea, this landscape of rocky ravines is filled with the fossils of ancient marine life.

The remains of a concrete ship sit on a sandbank between Ballina Quay and Belleek Woods.

One room inside this building mesmerizes all with its parabolic dome.

This only museum in the world dedicated solely to mushrooms.

The viewpoint for this attractive, off-the-beaten-path waterfall is reached by a paved, wheelchair-accessible trail.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

Two beautiful Victorian-era parks replete with ornamental waterfalls and lakes.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

Nature puts on a spectacular show at this blowhole on the eastern side of Gran Canaria.

Wooden pathways run through this rocky landscape, which legend says was created when a dwarven king pulled down his own castle to stop raiding giants.

Take an underground boat ride through a former hydraulic raceway that was built in the late 19th century.

At the base of Peña de Bernal, a small business keeps evidence of alleged extraterrestrial visitors on display.

This New York florist also sells traditional tofu pudding.

A single oak tree rises out of the waters of Loch Lomond.

The largest cave on the island of Menorca was likely the site of Iron Age rites and rituals.

A reservation-only highland forest reserve of endangered Pinsapar firs stands above a village in Andalucía.

The history of drinking is told through 1,800 cups, chalices, and glasses at this exhibit.

An interactive museum dedicated to preserving and sharing the history of the home computer.

This teeny-tiny park built by a San Francisco man in 1962 is mostly stairs.

Rome is now home to a stunning food museum and library.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'